Effects of Base Stock and Additive Components on the Viscosity of Crankcase Oils at 0 F 680068

Base stock and additive combinations were evaluated in the Cold Cranking Simulator (CCS) to determine their effects upon the viscosity of crankcase lubricants at 0 F. The interaction of polymeric additives with base stock wax was defined, and the role of base stock V.I. in cold cranking, ascertained. These factors were found to govern optimum selection of base stocks and polymeric additives in formulating multigrade crankcase oils.


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