Motor oil specification (Mercedes-Benz C-Class W202)

Only HD oils are allowed to be used in modern engines. They are alloyed oils whose lubricating properties are significantly improved by adding various chemical biocatalysts. These additives improve corrosion protection, reduce oxidation, especially sediment formation in the engine crankcase, improve the viscosity of oils and their dissolving properties. Cleaning and dissolving additives not only reduce the formation of deposits in the engine, but also dissolve these deposits, crush all other mechanical impurities in the engine oil and keep them in suspension, so that they are removed during an oil change.

The quality of HD motor oils is assessed according to the API system (API – American Petroleum Institute). European manufacturers also focus on this system.

Oils are designated by two letters. The first letter in the designation is the area of application: S – service, suitable for carburetor engines; C – commercial, suitable for diesel engines. The second letter indicates the quality in alphabetical order. The highest quality according to API specification: SG – for gasoline engines and CF – for diesel engines.

Attention! Motor oils that are labeled by the manufacturer as oils for diesel engines are not suitable for gasoline engines. There are oils that are suitable for both gasoline and diesel engines. In this case, both specifications are indicated on the oil container (for example, SG/CE).

Original material on the website [mercedesman.ru]