SEDL / STP / STP621_S1-EB / STP32377S

The Relationship of Journal Bearing Wear to Multigrade Engine Oil Viscometric Properties

Stambaugh, RL
Rohm and Haas Co.,

Kopko, RJ
Rohm and Haas Co.,

Bennett, PA
Rohm and Haas Co.,

Pages: 7    Published: Jan 1977

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Abstract

A high speed road test procedure was developed to demonstrate performance of multigrade engine oils in journal bearing wear protection. High shear viscosities of test oils were approximated through use of a pump loop. A reasonable first approximation of critical viscosity for bearing failure is estimated by measurements at 149°C and about 5×10⁵ sec ^-1 with the pass/fail limit being about 3.5 cSt.