1974-02-01

Prediction of Viscosity Stability of Multigrade Engine Oils in Service 740974

The viscosity change of multigrade motor oils in service has been evaluated in a fleet representative of the present European car population. The evaluation covered air- and water-cooled engines, with conventional and integral gearboxes, and displacements ranging from 500-1750 cc.
The effect of car, service, average ambient temperature, and type of polymer on the viscosity change of a lubricant has been estimated.
The multigrade test oils have also been run in injector and bench engine tests in order to compare field testing results with laboratory techniques being developed.

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