The generally accepted opinion, in determining the difference and differences between 0w40 or 5w40 engine oils, says that attention should be paid only to the first digit of the lubricant for the engine.
This is due to the fact that in the first case, the critical temperature at which the oil can freeze is 35 degrees below zero, and in the second, upon reaching 30 degrees of frost. But the question arises - how then do cars move at forty degrees and below in winter?
Are there any special oils for them that are not included in the all-season range?
Of course, oils are unidirectional, i.e. only for winter or summer, they have a more solid stable structure, but greases for year-round use also have a higher freezing threshold than a thermometer mark of 35.
This only confirms that everything engine oils differ from each other, and even those that are in the same key 0w40 or 5w40 according to SAE, but released from different manufacturers... Most often there are disputes about which is better 0w40 or 5w40, considering that both products are of synthetic origin, whether they can be mixed, whether it is necessary to wash the engine when replacing, etc. Let's try to understand in more detail this problem and give answers to all questions of interest.
Motor lubricants 0w40 or 5w40 - are there any differences?
To begin with, let's leave aside the viscosity of both lines of oils and recognize as a constant that all lubricants different frost threshold, even when specifying the standard SAE 0w40 or 5w40. In this matter, it is worth going back to the basics, namely the basic structure of motor lubricant. As has been said more than once, the quality of the working resource of engine oil directly depends on its initial base, which in most cases is natural, i.e. mineral with modern technologies cleaning. Moreover, one should not think that the same company, which is called the manufacturer, is engaged in the purification of the original product.
There are only about three corporations in the world that prepare base oil, they mainly purchase raw materials for further use, which means the addition of additives. The second type of base for motor oils is a synthetic product obtained exclusively through synthesis at the molecular level.
By right, synthetics are always more expensive and this is not caused by additive packages, but by the fact that the oil base will never be "sick" with the problems that natural mineral oil is prone to.
Considering the performance of both motor lubricants- 0w40 or 5w40 - at first glance, we can conclude that both lines belong to pure synthetic oils. In fact, this is not the case:
- 0w40 is definitely a synthetic and a confirmation of this is the increased fluidity of the oil.
- 5w40 - conditionally referred to as synthetic oils, since in most cases the quality of the oil
is achieved by the hydrocracking process, which means that the initial base of the oil is still mineral, as evidenced by the higher viscosity threshold for most products.
The protective properties of 0w40 and 5w40 will also be different, because initially the basic structure will be different and will give its own to each oil.
Additive packages
Having dealt with the basis, let's move on to the additives, which can also vary in any 0w40 or 5w40.
In this matter, the direction of the oil and its purpose are determined. For example, if the task is only for an easy start of the engine in frost, then such oil will never give a significant effect of fuel economy, but will allow it to start calmly even at minus 40. In the summer, it is better not to use it, since the product can be run off like water from all parts of the engine and do not provide adequate protection.
That is why fives are still recommended for summer, they are more resistant to high temperatures. Determine the fluidity, you can also familiarize yourself with the flash point, conditionally summer oils it will be much higher. Majority imported oils, even in the same ranks 0w40 or 5w40, will differ from domestic ones in terms of ecology.
Foreign manufacturers are trying to surpass the environmental standards established by ECO 5, while domestic ones will struggle with “not clean” fuel, which is filled at all gas stations without exception, even despite the EURO badges.
The purity of the fuel is also achieved by various additives, as well as the multidirectionality of engine oils.
Which oil is better than 0w40 or 5w40?
There is only one answer - there are no better or worse ones - there are those that are ideally suited for a particular car engine.
Again, production technology comes up in this issue. Hydrocracked oils will never be able to act as a coolant for modern modifications power units with adjacent systems, which means that even in the summer, despite the higher viscosity, they will not provide complete protection of all nodes.
Therefore, most auto concerns recommend for their engines all-season oils 0w40, 0w20, 0w30 with a fast flow at any time of the year and it is not viscosity and climatic temperature that plays the main role here, but thermal regulation under the hood of the car.
5w40 is no worse - this is also a high-quality consumable for lubrication, but it is aimed somewhat at something else. The gaps between the piston rings are different for all machines, which means that only the oil that has the best performance for this can protect and "plug" these gaps. The higher viscosity 5w40 is able to immediately form protection on all engine components, including the piston system.
The density and resistance to destruction of the film, will also be achieved due to additives, but also basic framework will contribute by being more sustainable. If we neglect all of the above and focus solely on the criterion of freezing, then it is worth going back to the very beginning and determining that for the summer period the oils are absolutely the same. True, 0w40 will most likely have to be replaced more often by those machines that are shown 5w40, because thermal oxides will destroy it faster.
Engine oil is the same working fluid as well as fuel. With the difference that it is not necessary to fill it so often. Nevertheless, the consumption of engine oils is estimated at millions of liters. Manufacturers are fighting in the competition, bringing new products to the market. In principle, all oils are divided into mineral and synthetic. Within one group, the oils have a chemically identical base. Manufacturers add secret, in their opinion, additives and additives to it, changing the properties of oils. Automotive magazines, TV shows, and the manufacturers themselves, regularly conduct tests, trying to determine which oil is better. Note that, first of all, any test checks the compliance of engine oils with the established tolerances before filling the engine, and after a specified test time. Tests are also carried out to check the working properties of oils without an engine, on special stands. Certification of oils is carried out on similar equipment before they go on sale.
New oils from each manufacturer, of course, comply with the tolerances, since they are subject to certification. But how quickly their properties go out of tolerance - the test shows. Consider the test results of 16 popular synthetic oils of common viscosity 5W30, produced in 2014.
Choose the most the best oil»The test cannot, since it will be determined by the buyer, but it is possible to demonstrate the main features. The following is a list in alphabetical order, indicating the country of manufacture, without assigning points:
- Castrol Edge with Titanium FST - Germany;
- Castrol Magnatec A1 - Germany;
- G-Energy F Synth EC - Russian Federation;
- Lucas Synthetic - UK;
- Mannol Elite - Belgium;
- Mobil 1 Extended Performance - Belgium;
- Motul 8100 Eco-nergy - France;
- Pennzoil Ultra - USA;
- Petro-Canada SUPREME Synthetic - Canada;
- Red Line High Performance - USA;
- Royal Purple High Performance - USA;
- Shell Helix Ultra Extra - Finland;
- TNK - Magnum Professional - Russian Federation;
- Total Quartz 9000 Future - France;
- Valvoline SynPower - Holland;
- ZIC XQ LS - Korea.
The test was carried out by the method of laboratory research, and practical motor tests... All engine oils have been tested to meet the tolerances and standards for 5W30 synthetic oils. However, there are nuances that we will briefly discuss.
Brief information on test results
Castrol Edge with Titanium FST - This oil benefits from increased film strength. This quality of engine oils extends the life of engine parts. The polymerization test showed high results. Alkaline reserve is normal. Large dependence of characteristics on the difference in ambient temperature. Therefore, it is better to use this oil in a car in temperate latitudes.
Castrol Magnatec A1 - Good polymerization test performance, maintaining target viscosity under all conditions. Film strength is average for the test. Excellent resistance to extreme low temperatures. Low score for the waste test. Alkaline reserve is below average, as a result - high residual acidity at the end of life tests. It is recommended to change this oil more often than usual.
G-Energy F Synth EC - The sample has a very strong film, it keeps its characteristics well with temperature spread. High fuel economy factor compared to other oils. The new oil has low acidity, the level of which has not increased much. Not a bad indicator of waste losses, but still having a margin for topping up will not hurt.
Lucas Synthetic - High level of scuff protection - film strength at height. Low waste. This oil requires virtually no top-up and allows for extended drain intervals. The viscosity index does not change at temperatures down to -30. The test showed a low alkaline reserve and poor engine cleaning capabilities. It is better not to use oil in vehicles with high engine loads.
Mannol Elite is not fudge-prone. Due to its strong film, it provides good protection against engine wear. High protection against oxidative processes minimizes corrosion. But when the temperature conditions of the engine change, it sharply changes the viscosity. Of course, within the limits of tolerance - but this fact must be taken into account.
Mobil 1 Extended Performance - Recommended by manufacturer for turbocharged engines with low film strength. Polymerization high, this test failed. Alkaline reserve indicators are normal, corrosion protection at height. Good cold start performance. When the temperature changes, it practically does not change the viscosity and chemical composition. There is no waste consumption.
Motul 8100 Eco-nergy - A confident middling test. With a change in operating temperatures, the viscosity characteristics also changed, but far from the limiting values. The waste consumption is small, but it will require topping up between replacements. Quite good value of residual acidity at the end of life tests. In general, the test showed nothing outstanding.
Pennzoil Ultra - Low film strength is compensated for good result starting the engine at a temperature of -30 degrees. At high temperatures, the loss of volatile fractions is insignificant, the waste will be small. Alkaline reserve is high, one of the best indicators of the test. Sufficiently versatile oil for all engines.
Petro-Canada SUPREME Synthetic - Medium Film Strength. Normal viscosity at winter operation... A fairly large waste, oil requires topping up already when half of the service interval has passed. High degree of polymerization. After passing the endurance test, the base number... All indicators are below average in the test.
Red Line High Performance - High film strength and very good alkaline reserve. With a cold start, the result is weak, it keeps high temperatures better. One of the best results in terms of burnout. Polymerization indicators are close to the tolerance limit. The scatter of results according to different criteria does not allow us to recommend this oil.
Royal Purple High Performance - The tests for this oil are patchy. High strength of the oil film. Good polymerization performance. Heating losses are also low. But the indicators when measuring the residual acidity, and the poor result at low temperatures, bring this oil to the bottom of the list.
Shell Helix Ultra - Practically the leader of the test in terms of performance. Lowest waste among tested samples. Good indicator of residual acidity, corrosion protection at height. The very low metal content in the drained oil after the life test indicates low wear of engine parts. The spread of characteristics with temperature changes is small.
THK Magnum Professional - In terms of price / quality, the best indicator of the test. Very low waste, practically does not require topping up. High levels of alkaline reserve. Film strength is one of the best in the test, it was confirmed by low level metal content in mining. The oil can be recommended for any engine.
Total Quartz 9000 Future - Good high temperature stability. Acid neutralization is also good. The high strength of the oil film ensures low wear of the motor components. The test showed that the oil does not lose its properties even at temperatures down to -30. The waste is too high, during operation in the warm season, it will be necessary to regularly top up.
Valvoline SynPower - This grease can also be considered a leader. It performed best in tests such as alkaline reserve, oil film strength, degree of polymerization. Good cleaning properties. Reduces gas mileage. Does not lose properties when low temperatures, but has a fairly high weight loss on heating. Suitable for all types of vehicles.
ZIC XQ LS - revealed best result to maintain viscosity with temperature changes. Good acidity at the end of the resource test. The wear of engine parts is high, the level of metal in the waste oil is high. By fumes - an average indicator, not worse than other lubricants.
Thus, having familiarized himself with the brief results of the test of oils produced in 2014, the car enthusiast will be able to make an independent and informed choice when buying motor oil.
The weather can be unpredictable. Car drivers are increasingly faced with the need to fill the engine with a universal type of oil. It is intended for use in hot or cold weather. In order for the unit to work efficiently both in frost and heat, oil is used 0 W40.
This consumable is produced by many large companies. The presented standard has a number of special characteristics. What features the presented oil has, it is necessary to consider in more detail.
general characteristics
0W40 is designed to protect the motor from abrasion and premature failure. It removes excess heat from rubbing mechanisms. This product also covers all metal surfaces with a thin film. It provides good sliding of the rubbing elements, prolonging their operation.
Also, the presented materials protect the motor from corrosion. They remove carbon, dirt and soot from the engine system. These particles are suspended in the oil. They build up over time. The grease changes its color to a dark, dirty shade. In this case, a replacement must be made. Otherwise, the grease will no longer be able to retain dirt in itself. They will settle on metal surfaces, causing microscopic damage to parts.
It is from the right choice engine oil depends on the easy start of the engine in cold weather, as well as the absence of overheating in the summer. Previously, manufacturers supplied the market with oils intended exclusively for the warm or cold seasons. Today the owners Vehicle acquire versatile products. They are designed for use in both hot and cold weather.
For each specific operating conditions, certain lubricants are suitable. The full operation of the motor, as well as its durability, depends on the correctness of their choice.
For the engine of your car, you need to use only the oil recommended by the manufacturer. If you need to change the lubricant to another variety, you should choose a composition with a similar set of additives. Products from different manufacturers may conflict with each other. This causes abnormal motor performance.
Viscosity index
One of the most important indicators oils 0W40, characteristics which is taken into account when choosing, is its viscosity class. Most often, this parameter is specified in accordance with the SAE (Society of Automotive Engineers) standard. It was this association that first proposed the classification of oils in terms of the viscosity class. It releases only 6 winter and 5 summer lubricants.
According to this technique, three types of viscosity are distinguished. There is winter, summer and all-season oil. The first category has the letter "W" in its labeling. The number next to it indicates the allowable limit at which the product is operated.
Summer greases do not have a letter in the marking. They only have a number. It denotes the upper viscosity limit. For universal formulations, the lower viscosity limit is indicated first, and then the upper one. fluid enough to start the engine at very low temperatures. Its upper viscosity limit indicates the ability of the engine to operate at high thermometer readings.
In other words, the oil of the presented viscosity grade is suitable for harsh winters and hot summers. For a hot southern climate, it is necessary to purchase products with a high level of viscosity. This will keep a thin film of grease on the parts, even in extreme heat.
Advantages
Motor oil 0W40, 5W40 is intended for use in the climatic conditions of our country. It can withstand severe frosts. This is a fairly liquid lubricant. Thick varieties are designed for high temperature applications. Under these conditions, the lubricant becomes more fluid and can completely fly off the mechanisms and parts. In this case, dry areas are formed, which will collapse during friction.
0W40 viscosity grade oil can provide normal work engine in winter at temperatures up to -40 ºС, and in summer - up to +35 ºС. This indicator also depends on the manufacturer. Each company uses a specific set of components for the manufacture of oil. Therefore, the main characteristics may differ slightly between manufacturers of different formulations.
However, the main benefits are retained in each type of oil. This class of lubricants is manufactured in accordance with the highest requirements of global automotive manufacturers. This product has good performance characteristics. It allows you to save gas mileage. High performance characteristics depend on the composition of the oil, as well as the additives included in it.
Composition
Manufactured using a specific technology. All such products are conventionally divided into several categories according to the composition of the base. A special set of additives is added to it. The base can be mineral, synthetic or semi-synthetic.
In the first variant, oil is processed by distillation and refining. Such a basis is used for the manufacture of cheap varieties of oils that will need to be changed quite often. It is used for older engine systems. For viscosity class 0W40, the mineral base is not used in its pure form. It is combined with synthetics. This increases the cost of the product, but also improves its performance.
Synthetics are created on the basis of artificial components. Such products allow for high fluidity of the oil. Synthetics 0W40 provides stable work motor even at very low temperatures. The product has a low evaporation rate. This is what ensures the ability of the lubricant to perform the functions assigned to it, even in the heat.
Synthetics are also resistant to oxidation and waxing. The listed characteristics can significantly extend the period of oil use. This type of lubricant is the best suited for the loaded operating conditions of the engine on the roads of large cities.
Semi-synthetics combine the qualities of both types of lubricants. Such a base is chosen for the manufacture of a lubricant for medium engine loads.
Shell oil
Experts have experimented with a variety of metrics that characterize popular motor oils. Such brands as Mobil, Castrol, Shell, etc. took part in the testing.
When conducting research in winter period it was found that Shell 0W40 oil has the approvals of almost all modern vehicle manufacturers. It provides excellent protection against all kinds of debris. There is no other oil in this category that would clean the engine so well. This is achieved thanks to a unique set of additives.
Thanks to its balanced viscosity characteristics, Shell 0W40 can save up to 1.9% more gasoline than other lubricants. It protects moving parts from corrosion and wear. The highly scientific formula of production allows the engine to start even at the lowest temperatures.
The presented oil is designed for gasoline, diesel and gas engines... It is also used for engines that run on biodiesel or gasoline-ethanol mixtures.
TO negative reviews opinions on the high cost of such products should be attributed (4 liters costs about 2,200 rubles), and car owners also blame frequent fakes.
Lukoil oil
Motor oil "Lukoil 0W40" also receives many positive feedback from motorists. This quality compound is made on a synthetic basis. Therefore, its cost is quite high (4 liters will cost about 1900 rubles).
This product has excellent performance characteristics. According to expert reviews, the oil has good detergent properties. It does not need to be changed frequently. For high load conditions big city it fits perfectly. The engine starts in winter even at -40 ºС. At the same time, the motor works stably and efficiently. Its power is increasing.
The oil contains special additives that protect the car system from corrosion and destruction. Thanks to the low burn-out rates, all parts are reliably protected. Dirt and soot can be suspended for a long time.
Due to its special characteristics, this product is recommended for use by many car manufacturers. It is more suitable for new foreign cars. For old domestic cars this product is not recommended for use.
Oil "Mobile 1"
Motor oil "Mobile 1" (0W40) characterized by a fairly acceptable cost. A standard 4 liter canister will cost about 1,700 rubles. It is allowed to be used for both foreign and domestic new cars.
During testing, it was found that the oil solidifies at a temperature of -49 ºС. Such viscosity characteristics allow the engine to be started in Specifications, incorporated by the manufacturer into this product, allow it to be used even in northern latitudes.
It is a versatile lubricant. It allows you to provide enough good cooling systems during a hot period.
The product demonstrates good detergent properties. However, when opening the engine after testing, some carbon deposits were found on the pistons. At this cost, users expect better cleaning performance.
Oil "Motul"
The above motor oil "Mobile 0W40" in many respects it is similar to the product of the same viscosity class called "Motul". This lubricant is versatile. It is suitable for use both at low temperatures (-48 ºC) and in hot weather.
The product is available in 5 liter cans. Their cost is about 2500 rubles. Affordable cost makes the product popular with drivers. It can be poured into the engine of both foreign and domestic cars.
Its energy-saving and detergent qualities are also noted. This grease has shown good results in almost all areas of testing. At high engine heating temperatures, the amount of deposits on the pistons is negligible. This makes the product in demand, especially in the loaded conditions of movement on the roads of the metropolis.
Some drivers claim that the cost of the presented vehicle is high. However, the amount of oil in the canister will be more than that of other manufacturers. In terms of the price for 4 liters of oil will be acceptable.
Castrol oil
European-made Castrol is also known to domestic consumers. This product is available in 4 liter canisters. Price consumable is about 1,750 rubles.
At affordable price this product has high performance indicators... This oil solidifies at a temperature of -52 ºC. This figure is a record among the lubricants participating in the test. This indicates the high quality of the base.
An effective set of additives allows Castrol oil to provide a high-quality detergent effect. After testing the product under high engine load, high piston cleanliness could be observed. Also, the presented agent protects the metal elements of the system from oxidation.
Many drivers choose this type of grease due to its reasonable cost and high European quality. However, in terms of energy saving, the presented product is slightly inferior to other test participants. This speaks of more high flow fuel when the engine is running.
Liqui Moly Oil
The most expensive among the considered products of well-known manufacturers turned out to be oil. It is sold in five-liter canisters. The cost of such a product is 2700 rubles. The manufacturer of the presented lubricants is Germany.
Liqui Moly has approvals from many major engineering concerns. Its performance remains high. The oil allows you to quickly start the engine in low temperature conditions. This provides really reliable lubrication of rubbing mechanisms.
Also, the presented tool allows you to significantly save fuel costs. An insufficient level of detergent qualities... A sufficiently large amount of soot and carbon deposits is determined on the cylinders after the tests. Piston rings fail faster than with other types of products.
Liqui Moly is known for the longest aging period. It can be operated for a long time. The oil will not burn out.
Having considered the features that characterize the 0W40 oil, as well as reviews from experts and experienced drivers, we can conclude that it is necessary to use such a composition in the engine of your car.
Why exactly at the moment of starting the engine its most intensive wear occurs? The fact is that sleeve bearings used in the crank mechanism and other mating parts work with inevitable friction against each other. Ideally between the indigenous, connecting rod bearings and crankshaft there should always be an oil layer.
In practice, everything happens differently. The crankshaft components are pressure lubricated. The oil is supplied to the lubrication points through special channels. When the crankshaft is cranked by the starter, the oil pressure is still not enough to supply it to all rubbing parts. As a result, mechanical friction appears between them. The harder metal literally begins to plane and flatten the softer. Micro-seizures form on the liners, camshafts, valve sleeves and cylinder walls, which further significantly worsen sliding, and the engine life is significantly reduced.
In addition, dry friction is always accompanied by an increase in the temperature of the parts, disrupting the structure of the metal. Especially dangerous is the "dry" start of the engine in severe frost. Many people know firsthand how much sawdust and even shavings flows down together with used oil from the engine sump, which was intensively operated in the cold winter period.
Engine oil thickened in the cold makes the situation even worse. In this case, the salvation for the engine is the ability of the oil to form a film on the surfaces of all parts. It is this oil film that works until the oil pressure rises and flows through the supply channels.
In the old days, when many engines did not have pressure lubrication, their mileage to the capital by today's standards was simply ridiculous: only a few tens of thousands of kilometers. In those days, each driver, in addition to the main tool, also carried with him special molds for melting babbitt. Are you ready to make a fire today in a severe frost, remove the engine sump and smelt new liners? If so, then this article is not for you.
All 0W40 engine oils are universal for use in all temperature conditions. Even in arctic cold conditions, such oil retains its fluidity, without liquefying and not rolling down drops from rubbing parts.
When to use 0W40 oil best
These types of oils perfectly retain their fluidity and enveloping properties at low temperatures, which means they are perfectly pumped by an oil pump and starts to "work" already at extremely low crankshaft speeds. This property is indispensable in winter, especially in temperate latitudes with cold and long winters. But, will oil with a low temperature 0W index behave well in the summer? After all, there are oils with a higher "summer" index, for example 50 and even 60. Modern engines experience higher dynamic, temperature and pressure loads. Have you seen how oil collects in drops in a hot frying pan?At extremely high temperatures, the oil can lose its lubricating properties. If this happens in the engine, for example, during prolonged standing in a summer traffic jam, it will inevitably fail even with a working cooling system. Therefore, engine oil must retain its lubricating and heat dissipating properties even at very high temperatures.
Motor oils of the 0W40 brand are universal multigrade oils due to the retention of their lubricating properties under aggressive conditions in a wide temperature range. This oil can be used in any seasonal conditions on an engine that is known to be in good working order.
Other properties of motor oils
Equally important is the presence of various auxiliary additives in engine oil. Often, it is the additives that largely determine the physical and chemical properties of modern engine oils. Many lubricant manufacturers advertise their products extensively, focusing on the different properties of the additives. For example: detergents, regenerating, cooling, etc. As for additives, the opinions of experts and ordinary motorists differ greatly. Of course, no additives are able to restore worn parts, but some of them are capable of filling micro-seizures and microcracks, thereby extending the service life of many engine components and assemblies.
On the other hand, is there a guarantee that the restoring additives will act "targeted" - to settle only on damaged surfaces without clogging the oil channels and not accumulating in the form of indelible deposits? The so-called "detergent" additives, on the contrary, contribute to the effective cleaning of lubricated parts from carbon deposits, slags, coke and other deposits that arise for various reasons (use of inappropriate fuels and lubricants or their poor quality, violation of operating conditions or engine operation as a result of a breakdown of any system, etc.).
Detergent additives in engine oil are undoubtedly beneficial. Even visually, engine parts become much cleaner. However, do not forget that oils with detergents should be used for a short time. Otherwise, you can get the opposite effect. For example: oil, having washed off all deposits on the parts of the gas distribution mechanism, clogs with these deposits oil filter or even worse: transports these deposits straight into the lubrication channels of the crank mechanism. Such a "disservice" of detergents can only please the mechanics - minders for the fact that it gives them a good income.
Another, no less unpleasant side of oil washing is the appearance of drips at the joints of blocks and engine parts. The fact is that detergent additives are so effective that when there is nothing to wash, they begin to wash away deposits from the joints: gaskets, bolts, studs. As a result, the oil begins to squeeze out. Therefore, oils containing a large amount of such additives should be used only to eliminate certain problems, for example, to effectively wash the engine from internal deposits without completely disassembling it.
Along with additives that help clean parts, many types of engine oils, especially mineral oils, are capable of forming deposits themselves as a result of exposure to high temperatures in combination with an influx of oxygen. Simply put, the oil begins to burn, leaving carbon deposits on the surface of the rubbing parts. For example, when oil burns out in cylinders, instead of a saving oil film, soot is formed, which has strong abrasive properties. And this means that at the moment the oil burns, an emery wheel passes along the mirror of the cylinders of your engine. Is it worth explaining further how this affects his resource?
Resistance to combustion, low volatility - these properties are as important in the summer as the ability of the oil to remain fluid in the winter. Modern synthetic oils, including those with the 0W40 index, have the ability to withstand high temperatures without significant evaporation and are more resistant to oxidative chemical reactions (combustion).
Along with the physical properties, motor oils, as well as the additives in their composition, are able to enter into various chemical reactions with metals at high temperatures. In other words, the additives contained in the oil can cause acidic and alkaline reactions with the internal elements of the engine. Aggressive chemicals contained in the oil with prolonged use can destroy rubbing metal surfaces, corrode oil seals and gaskets. Therefore, before using this or that oil, you should carefully familiarize yourself with the various additives that make up its composition.
In what cases the use of 0W40 engine oil is impractical
Despite the large number of indisputable advantages of 0W40 motor oils, in some cases their use will not be entirely justified. For example, if the car is not used in winter. In this case, maintaining the viscosity of the oil at low temperatures is completely irrelevant. In addition, it is advisable to replace any oil after a long parking lot due to condensation formed in the lubrication system, as well as due to precipitation and deposits formed during long-term garage storage of the car.Strongly worn out engine waiting to be replaced soon, or overhaul- also far from the most suitable consumer of 0W40 oil. In this case, it is advisable to use more viscous oils to increase the compression and optimize the operation of its systems.
Many older car models can also be very sensitive to the viscosity of engine oils. Therefore, before filling the 0W40 lubrication system, read the engine manual and the manufacturer's recommendations. If, for some reason, there is no data on the possibility of using engine oils of the appropriate viscosity, in extreme cases it is advisable to be guided by the rule: the more revving engine, the less viscous oil it needs for optimal operation. If the engine is worn, it has high mileage, then vice versa: what more mileage, the higher the viscosity of the oil.
