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.

SAE MOBILUS

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