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Motoring Today




Based on the requirements of a car engine, engine oil is selected according to two main criteria: API class and SAE viscosity. We will tell you what it is and what oil to choose for a car - how to correctly identify different oils.


Which is better to use?

Motor manufacturers at the design stage are determined with the brands of oils depending on the working conditions and design features. After that, engine life tests are carried out and recommendations for use are issued. So, before choosing, you need to look into the operating instructions, what exactly is necessary. The oil indicated in the instructions is the right choice.

If you do not want to fill in the original branded oil, then you can do it aftermarket. And in order not to make your warranty void, you should choose it with the approval of your dealer mechanic. The approval of the auto manufacturer is one of the main guidelines for choosing. The approval mark indicates not only the name of the car brand but also a special index, which is comparable to what is indicated in the automobile documentation. Depending on your warranty policy, you could be limited to certain branded oil. The main thing is that the product specifications comply with the manufacturer's recommendations. In the event of a motor breakdown, into which non-original oil, but satisfying the basic requirements, was poured, the dealer can refuse warranty repair only if the examiner determines that it was fake. Use oil recommended by the manufacturer. If you choose on your own, then it is selected according to two main parameters: by group and quality class. It will also be useful to find out if various auto oils can be mixed.


SAE Classification

The main property of motor oil is viscosity and its dependence on temperature over a wide range. We give the standard classification according to SAE: 10W-40. The first designation is “10W” for application temperature and “40” for viscosity. We will talk about each parameter separately. The most noticeable figures on the canister speak about the viscosity of the oil - this is a classification by SAE. Two numbers separated by the letter W indicate that it is all-weather. The first digits indicate the minimum negative temperature at which the engine can be cranked. For example, when referring to 0W-40 lower temperature threshold is -35 to C, and at 15W-40 it is -20 to S. The number after the hyphen indicates the permissible range of change of viscosity at 100 of S.

Performance ranges of winter, summer and all-season oils With an average climate, it is recommended to use the "universal" 10W - it is suitable for most cars. If the winters are harsh, then you should fill the oil with a class of at least 5W (best would be - 0W). For summer operation, 10W is suitable.


Selection guidelines

When the vehicle mileage is less than 50% of the planned resource (new engine), oils of classes 5W30 or 0W20 must be used. This is due to the fact that the new engines have no wear and tear, all clearances are minimal, so the bearings work at a lower viscosity. with a vehicle mileage of more than 50% of the planned resource (technically sound engine), it is advisable to use class 5W40 oils. This is due to the fact that with high wear, the bearing capacity is compensated by an increase in viscosity. Modern motors require low viscosity oil, as it has low energy-saving properties and allows you to save fuel. Fluids with a viscosity of not higher than 30 are poured from the conveyors. If the mileage of the car is large and increased consumption is noticeable, then oil with a higher viscosity index should be used.


Not replacing the engine oil is one of the worst things that can happen to a car. Engines that have been running on old oil will have extensive damage and wear. If you car has been in such a situation, it might be the best idea to sell your car. Car removal services such as Elite Car Removals will pay you cash for your damaged car.

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