what oil is best for my 1989 gmc sierra 2500 4 wd

Asked by Aug 21, 2015 at 07:48 PM about the 1988 GMC Sierra 1500 C1500 Extended Cab LB

Question type: Maintenance & Repair

1 Answer

40,615

What ever is recommended in your owners manual. Don't swap to synthetic with an engine that old. During summer months, it's fine to go to a heavier oil. Just be sure to go back to the recommended weight come winter.

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