SPONSORED LINKS

1991 GMC Sonoma Engine oil

Tiny
MIGUEL LOPEZ
  • MEMBER
  • 1991 GMC SONOMA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
I have a GMC Sonoma 1991 4x2 4.3L, V6. I changed the engine few years ago, but "new" engine has 120000 miles already. Is working fine, I take good care of it. My question is: What kind of oil should I use in this high mileage engine? I have been using 10-40 all the time but wonder if I should change to another oil. Can I use synthetic or do you think it's not recomended in this old car? I live in Florida, hot weather. Thank you very much for your help.
SPONSORED LINKS
Sunday, November 22nd, 2009 AT 11:09 AM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
You don't need to do anything specific as the recommended oil will be fine.

https://www.2carpros.com/articles/how-to-change-engine-oil-and-filter

If you want to use synthetic, then that is fine. It will give a little better protection but the nice thing is it will last longer and so you can spread out the oil chances a little more.

I am attaching the OEM spec below and if it were me, I would stick with this weight and if you want to use a high mileage additive then that will work as well.
Image (Click to make bigger)
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Saturday, January 8th, 2022 AT 9:23 AM

Please login or register to post a reply.

Related Oil Type Content

VIEW MORE

Sponsored links