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Old 11-06-2008, 19:25   #1 (permalink)
elephantEngine
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Join Date: Nov 2008
Posts: 1
engine oil - 5W30 vs 10W-30?

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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