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

115,135

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.

115,135

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.

Your Answer:

C/K 1500

Looking for a Used C/K 1500 in your area?

CarGurus has 6 nationwide C/K 1500 listings and the tools to find you a great deal.

Postal Code:

Chevrolet C/K 1500 Experts

  • #1
    Andrew Olsen
    Reputation
    4,450
  • #2
    John Saffrahn
    Reputation
    2,750
  • #3
    Rowefast
    Reputation
    2,440
View All

Related Models For Sale

Used GMC Sierra 1500
80 Great Deals out of 11,004 listings starting at $4,499
Used Ford F-150
115 Great Deals out of 11,141 listings starting at $369
Used Chevrolet Camaro
6 Great Deals out of 999 listings starting at $4,500
Used Chevrolet S-10
5 listings

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.