Concepts standards on the topic of oil

Viscosity: A measure of the fluidity of a lubricating oil. In winter, the first choice should be thin oil, which, after starting a cold engine, is immediately supplied to all lubrication points. In summer, on the contrary, a more viscous oil is in demand, which does not allow the lubricating film to break even at high temperatures.

SAE class (Society of Automotive Engineers - Society of Automobile Designers): Viscosity grade designation, such as SAE 5 W-30. The lower the first number, the more fluid the oil is in cold weather (W (Winter) -winter). 0W oil provides lubrication even at -30 'C. at 5W this figure rises to -25 'C, at 15W to -15°C. The larger the second number, the better the oil resists high temperatures.

ASEA (Association des Constructeurs Europeen d'Automobiles - Society of European Automobile Designers): The European oil standard introduced in 1996 replaces the CCMS standard. For gasoline engines there are groups A1 (economical oil), A2 (slightly loaded oil), AZ (high performance oil). For diesel engines, there is a division into B1, B2 and VZ.

SSMS (Comittee des Constructeurs d'Automobiles du Marche Commun - Committee of Automobile Constructors of the Common Market): the specification consists of the letter G (Gas engine) and PD (diesel engine) and out of number. The higher the number, the better the quality of the oil.

API (American Petroleum Institute - American Petroleum Institute): the specification consists of the letters S (Gas engine) and C (diesel engine) and other letters. The higher the letter in the alphabet, the better the quality of the oil.