Ford Mustang ForumThis forum is for the discussion of all Ford Mustang models, including the Ford Mustang, Ford Mustang Convertible and Ford Mustang Coupe and all older/classic models and submodels.
My 1995 Mustang GT owner's manual specs 10W30 oil for temps above 0 F. My local mechanic just put in 5W40, which is spec'd for below 0, and listed as "acceptable" for below 60 F. Should I make him change it out for 10W30?
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