engine oil - 5W30 vs 10W-30? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
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post #1 of 2 (permalink) Old 11-06-08, 06:25 PM Thread Starter
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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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post #2 of 2 (permalink) Old 06-13-09, 09:41 AM
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Re: engine oil - 5W30 vs 10W-30?

10-30 yes , im glad i change my own oil in my veh,s
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