Viscosity values at the shear rate and temperature of this test method have been indicated to be related to the viscosity providing hydrodynamic lubrication in automotive and heavy duty engines in severe service.

The viscosities of engine oils under such high temperatures and shear rates are also related to their effects on fuel efficiency and the importance of high shear rate, high temperature viscosity has been addressed in a number of publications and presentations.

1. Scope

1.1 This test method covers the laboratory determination of the viscosity of engine oils at 150 °C and 1.0·10⁶ s⁻¹ using a viscometer having a slightly tapered rotor and stator called the Tapered Bearing Simulator (TBS) Viscometer.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

Keywords

dynamic viscosity; engine oils; high shear rate viscosity; high shear viscosity; high temperature viscosity; high shear rate viscosity at 150 °C; rotational viscometer; Tapered Bearing Simulator Viscometer; TBS; used engine oils; Automotive engine fuels/oils; Calibration--petroleum analysis instrumentation; Fuel oils; Loading tests--petroleum products; Lubricating oils; Newtonian fluids; Non-Newtonian fluids; Rotor position value; Shear testing--petroleum products; Tapered bearing simulator; Temperature tests--petroleum products; Torque--petroleum materials/applications; Viscometers--tapered bearing simulator-viscometer (TBS);

ICS Code

ICS Number Code 75.100 (Lubricants, industrial oils and related products)

Citing ASTM Standards

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