This Malaysian Standard covers the laboratory determination of the viscosity of engine oils at 150°C and 1 × 10 6 s?1 shear rate using a tapered bearing simulator-viscometer (TBS Viscometer) equipped with a refined thermoregulator system. Older TBSunits not so equipped must use Test Method D 4683–87.
The Newtonian calibration oils used to establish this test method cover the range from approximately 1.5 to 5.6 cP(mPa·s) at 150°C.
The non-Newtonian reference oil used to establish this test method has a viscosity of approximately 3.5 cP (mPa·s) at150°C and a shear rate of 1 × 106 s ?1.
Applicability to petroleum products other than engine oils has not been determined in preparing this test method.
This test method uses the centipoise (cP) as the unit of viscosity. For information on the equivalent SI unit, themillipascal second (mPa·s) is shown in parentheses.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the respon