This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Impact of the New SAE J300 Viscosity Classification on European Engine Oil Formulations
Technical Paper
CEC97-EL12
Sector:
Language:
English
Abstract
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.