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Impact of the New SAE J300 Viscosity Classification on European Engine Oil Formulations
Published May 13, 1997 by Coordinating European Council in Belgium
The work completed in the USA by the ASTM Low Temperature Engine Performance Task Force showed that modern engines were capable of starting at temperatures at which there was no guarantee that the oil would be pumpable. We have referred to the range of temperature over which no protection was provided as "The Unprotected Zone". This situation has led to a revision of the SAE J300 viscosity classification which now includes more severe viscosity limits measured in the MRV viscometer according to ASTM D 4684.
This paper presents the rational for revising the viscosity classification and evaluates the level of severity increase which resulted from the change in the test temperature and in viscosity limits for the MRV test. For this purpose, we analyzed data obtained on 136 European passenger car commercial engine oils.