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  1. #1

    Default What oil are you using in your GM?

    I usually us Valvoline or Mobile Synthetic oils.

    I am looking into Amsoil. For the new 2010 4.8 Silverado.

    What are you using?

    Sorry if they're is already a topic on this. I searched and found nothing.

  2. #2


    I dont know if this helps you, but I have a 05 silverado z71 and im using Royal Purple for my 5.3l vortec.

  3. #3
    Jr. Mechanic
    Join Date
    Apr 2010
    Ortonville MI


    Mobile 1 5w30 synthetic.

    07 NBS Crew cab SLT 4x4

  4. #4


    valvolaine max life.

  5. #5


    I use Mobil 1. I've ran it in everything from my 7 sec (1/8th) CRX Racecar to my wife's Lancer. Very good oil, never had any issues with changes in viscosity or pressure. If it is approved by Honda, it's obviously good, because they have one of the highest oil standards amongst car manufacturers.
    "If orange juice had armpits, maybe."
    -the wife in reference to the smell of JOOSE

  6. #6


    I use Castrol High Mileage 10w30 in my car and both trucks. Seems to work well and it's nice being standardized in oil weight amongst all the vehicles. I think they all call for 5w30, but with the heat down here, I figure 10w30 works just as well if not better.

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 277K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half

    There are 10 kinds of people, those who understand binary, and those who dont...

    Remember kids, the only difference between screwing around and science is writing it down- Adam Savage

  7. #7
    The Cheap-*ss Modder & Thread Killer
    The Realist says, "The glass is too big".

    2013 GMC Sierra 1500 SLT Z60 4WD Crew Cab
    Mineral Green Metallic w/ Tan Leather Interior
    5.3 L FLEX w/AFM, 6A, Cheap-*ss Mods
    32 Dump Club Member
    Range V8 AFM Eliminator

  8. #8


    Quote Originally Posted by Farmerdave View Post
    Mobile 1 5w30 synthetic.
    Times two!
    Still Loyal to GM after all these years...:shocked:
    2006 Impala LT 3.5L
    2005 Silverado WT small cab/longbed 4x4 4.3L V6
    1999 Grand Am 3.4L in TX w/ our youngest
    1993 GMC Jimmy 4.3L 4 door 4x4 'Ole Rusty' - 'SOLD'
    1988 S-10 small cab/longbed HT3.4L Crate Engine
    1970 Nova 250 I-6, factory 3 sp floor shifter.
    1968 Chevelle 'Nomad' Wagon 250 I-6 w/ 3 on da' tree.

  9. #9

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


    Bought my 98 Suburban 3 years ago-195,000 miles-and switched it right away to Mobil 1 5W30-recently I switched it to 10w30 because I figured the slightly higher weight might be better for a high mile vehicle. No problems with it-great hy mpg for a huge vehicle.
    I read somewhere that 10w30 starts with thicker base oil(probably longer chain molecules??) , and it needs fewer viscosity modifying molecules to pour like a 30 weight (at whatever temp it is measured at)- and will have relatively more pure "lubricating molecules." This sounded plausible , but that doesn't mean it is so.
    I live in New Orleans-hot climate-so the oil is never as thick as it is in colder climates.
    1998 suburban-
    1/2 ton

    199500 miles

  10. #10
    Master Mechanic Silverado Junkie's Avatar
    Join Date
    Feb 2010
    Lead Hill, Arkansas


    I run 10w-30 Castrol GTX with Lucas Oil Stabilizer.
    1995 Silverado,Z71, 3-inch lift,2-inch leveling kit, SkyJacker Suspension, short ram-air intake, throttle body spacer, MSD ignition coil, straight pipes

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