High Mileage oil change for 1994 GMC Suburban

[SUV1962]

Hello All,

I am confused after contacting several service departments both commercial and dealers and need some clarification or help. I own a GMC Suburban with high mileage over 160K and need to know the type of oil best suited for this to include the weight prefferably recommended. I really cant seem to narrow down the type oil to use, any recommendation?

[Nick Keck]

I use Valvoline 10W30 Max life in mine

[L0sts0ul]

10w30 mobil 1 semi synthetic ( only on non vortec motors ) ... my truck has 380,000KMS on it.

[phoebeisis]

My 1998 Suburban 5.7 1/2 ton -has 214,000 miles. I use Mobil 1 10w30 -I use the Extended performance or the High Mileage -doesn't seem to make any difference which I use. It gets me good mpg(no kidding 21 mpg hy at 65 mph) and I use less than 1 quart per 4000 miles in mainly city driving.Your motor probably calls for 5 w30-like mine- but I switched to 10w30 because my oil pressure is 20 psi at idle (once warm) and my guess is a new motor probably runs 35-40 psi at idle. My pressure is 40 psi at 60 mph(1700 rpms).
Charlie

Charlie

[murdog94]

All of my TBIs have run either valvoline 10W30 or Mobil 1 high milage 10W30... I would run 10W30 of any brand of oil you are planning on running. That weight of oil makes for a good all season oil. I live here in MN were it is minus 40 in the winter and can get as hot as 100 above in the summer.

[Eddie Z71]

Hi, and welcome to the site!

[silveradotrailblazer]

Welcome to the club. Mobil 1 10-30 extended performance here.

[SUV1962]

Thanks All!!, these are all good information. Now i am having to relocate to a more colder climate (snow). My vehicle has always been in Arizona, does it matter on the type of oil to include weight. Can anyone also advise what should i prep my vehicle prior to relocating.

[murdog94]

Im going to move this to the Maintenance tech forum. Also where are you moving to? here in MN i run 10W30 year round unless i happen to do my oil change mid dec-to mid jan then i will run 5W30 if we are having a cold winter since -40 F can be a little hard on it. But otherwise 10W30 will be just fine.

[SUV1962]

Moving to Virginia