Oil and Oil Filters
GMC Jimmy

Which oil do you need for a 91 V6 Jimmy?

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Wiki User
February 13, 2008 11:18PM

This information can be found in your owner's manual. If you

don't have one, you can order one from a dealer. You may also find

one at a salvage yard. I have a 91 S-15 Jimmy 4x4...4.3L...and I

run 10W30 Valvoline in it year round. Depends on driving conditions

and weather. 5w30 is a good middle of the road oil. Make sure the

oil you use meets API standards. I just use 5w 30 year around.

Especially in the cold weather it circulates easier. Honestly your

owners manual should say 5w 30. However that is the manufacturers

suggested oil for when the car was made. What weight oil you use

especially for older cars should be based upon how many miles you

have on it. If it's a 91 I'd say you have over 100k on the clock.

Use 10w 30 year round. If you want in the summer you can use 10w 40

because oil tends to run thicker in the summer. If you notice any

oil leaks then up the weight to 10w 40 and 20w 50 in the summer or

use an oil additive such as Lucas.

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