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Why not just use diesel rated oils since they contain higher levels of ZDDP ?

April 26, 2017contain diesel levels Oils rated zddp

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Why not just use diesel rated oils since they contain higher levels of ZDDP ?

1 Answer

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10 Posted

Diesel engine requirements are much different than those of gasoline engines. The higher speeds and lower bearing surface-to-power ratios of gasoline engines require oil with higher shear ratings than most diesel oils. Diesels also have higher bearing clearances, which call for higher viscosity oils. The additional detergents required for soot control actually reduce the effectiveness of added levels of ZDDP found in diesel oils.