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  1. #1

    Default High Mileage oil change for 1994 GMC Suburban

    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?

  2. #2

    Default

    I use Valvoline 10W30 Max life in mine

  3. #3
    Jr. Engineer
    Join Date
    Feb 2007
    Location
    Edmonton, Alberta, Canada
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    298

    Default

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

    1993 K1500 Suburban 350TBI, 378,486KMS on frame, 49,000KMS on Drivetrain. Lots of mods, built for haulin trailers and haulin @$$ :)

    2000 K2500 Yukon XL 6.0L Vortec 252000KMS custom CAI, and exhaust...but not done yet.

    "If you are dumb enough to do something you don't know how to do, and can't do it safely then WHEN you get hurt its your own fault...BONEHEAD"

  4. #4
    Legend

    Join Date
    Jun 2006
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    River Ridge Louisiana-4 miles W of New Orleans-didn't flood-water stopped 800 yards away.
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    Default

    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
    1998 suburban-
    1/2 ton

    199500 miles
    River
    Ridge,LA

  5. #5
    Legend
    murdog94's Avatar
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    Feb 2008
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    Cloquet, Minnesota, United States
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    Default

    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.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  6. #6
    Legend
    Eddie Z71's Avatar
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    Mar 2009
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    Colorado Springs, CO
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    Hi, and welcome to the site!
    Eddie , 2000 Chevy Tahoe Z71 (old style)

  7. #7

    Default

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

  8. #8

    Default

    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.

  9. #9
    Legend
    murdog94's Avatar
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    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.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  10. #10

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