1991 Cherolet work truck 4.3 L V6 engine Best motor oil weight?

Asked by Jul 01, 2017 at 05:25 PM about the 1991 Chevrolet C/K 1500 RWD

Question type: Maintenance & Repair

I have been using 10-30 but the truck runs slightly rougher the past couple of
years. Interested in recommendations for the best motor oil weight. Original
engine, love this truck.

3 Answers

86,075

The oil weight has nothing to do with rough running, just change it every 3,000 miles. Try tuning it up.

1 of 1 people found this helpful.

I probably shouldn't have mentioned rough running. It is very slight. I am a stickler about changing the oil, which is probably why the truck is doing so well at 26.5 years. I would still like to hear about other people's experiences with oil weight. As far as a tune-up, I plan to it when it is due. Maybe a little sooner.

86,075

If the engine is not using oil I would stick with what you are using. If it is you could try 10W-40.

1 of 1 people found this helpful.

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