The European passenger car engine lubrication requirements are not the same as the American requirements.
The differences are determined by the eingine design trends, the nature of fuels used and the type of service.
The European engine and petroleum industries have undertaken the study of engine oil evaluation tests that meet European requirements.
On the basis of the present standardized tests, engine manufacturers have recently proposed a specification for crankcase oils.
This paper discusses particularly the European tests as to repeatability, reproducibility and correlation with service.
Mention is also made of the recent European proposals for revision of the SAE Crankcase Oil Viscosity Classification.