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What oil are you using in your GM?

Discussion in 'Maintenance & Upkeep' started by jbird, Jun 24, 2010.

  1. jbird

    jbird New Member

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    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.
    #1
  2. stephen115

    stephen115 New Member

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    I dont know if this helps you, but I have a 05 silverado z71 and im using Royal Purple for my 5.3l vortec.
    #2
  3. Farmerdave

    Farmerdave New Member

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    Mobile 1 5w30 synthetic.
    #3
  4. bobby1964

    bobby1964 New Member

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    valvolaine max life.
    #4
  5. grrr...

    grrr... New Member

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    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.
    #5
  6. Crawdaddy

    Crawdaddy Moderator

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    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.
    #6
  7. BigBlueLB756

    BigBlueLB756 New Member

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  8. wis bang

    wis bang New Member

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    Times two!
    #8
  9. phoebeisis

    phoebeisis New Member

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    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.
    #9
  10. Silverado Junkie

    Silverado Junkie New Member

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    I run 10w-30 Castrol GTX with Lucas Oil Stabilizer.
    #10
  11. jbird

    jbird New Member

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    Bigblue....good info thank you
    #11
  12. Z71_guy

    Z71_guy New Member

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    Kendall GT-1 full synthetic with liquid titanium 5w30 in the truck and 10w30 in the GTP
    i use it mainly because i get it for less than 2 bucks a quart at my work
    #12
  13. chancek31

    chancek31 New Member

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    I use either Mobil Clean 5000 or Castrol GTX 10w30. Both are great. Mobil Clean 5000 is good for 5000, but I change every 3k anyway, so I know it won't break down.
    95 GMC Sierra 1500, 305 tbi
    #13
  14. engineerbrian

    engineerbrian New Member

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    Good ol' Exxon Super flow in every car or truck i have ever owned.
    #14
  15. 4wd52

    4wd52 New Member

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    Amsoil 0w30 with bypass system. in the o4 Tahoe, Amsoil 5w30 in 93 suburban 144k, XL 5w30 7500 k oil in 99 Astro 150k and counting.
    #15
  16. 2000sierra

    2000sierra New Member

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    I use Mobil - 1 synth. 5W - 30.
    #16
  17. silveradotrailblazer

    silveradotrailblazer New Member

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  18. ChivaLRy

    ChivaLRy New Member

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    Quaker State 5-30 in a 02 5.3l
    #18
  19. Als09Sierra

    Als09Sierra New Member

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    #19
  20. hundojoe

    hundojoe New Member

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    Mobil1 10W-30 since new
    #20

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