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.

4 Answers

134,965

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

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.

134,965

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

1 people found this helpful.

I have a '92 Silverado with 309,000 miles I bought new in 1992. Have lived in NC, TN, KY and have always used Castol GTX 10W-40 conventional oil and changed every 3000 miles. Truck still going strong.

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