> This is all true for new engines. Old clunkers have wider gaps and need > heavier oil to fill them. AFAIK only Hondas (<g> Budda's name be > praised!) and newer GM engines have a special design that needs 10w30 no > matter what. I was told it has something to do with upper part of > cylinder block... > My new Chevy truck (for getting Audi parts) says 5w30 preferred or 10w30 ONLY! Orin.