1991 Cherolet work truck 4.3 L V6 engine Best motor oil weight?
Asked by Trckn555 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.
5 Answers
The oil weight has nothing to do with rough running, just change it every 3,000 miles. Try tuning it up.
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.
If the engine is not using oil I would stick with what you are using. If it is you could try 10W-40.
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.
1993 4.3 Chevy pick up oil pressure pick out 80 Plus pressure drive over 40 miles hour ( Idle pressures 40)
