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Thread: synthetic oils

  1. #11


    For info out the wazoo regarding motor oils, check this out:

  2. #12


    I started using Mobil 1 in my 'burb. It has 120,xxx miles on it. Been using it for more than a year. No trouble. Seems to run better than ever.
    "Help, I'm surrounded by Amish!"
    1999 GMC Suburban 5.7 4x4
    2001 Subaru Outback 3.0 LL Bean
    1980 VW Rabbit Convertible (before they went Cabriolet)

  3. #13
    Jr. Mechanic Sooner's Avatar
    Join Date
    Oct 2007
    Oklahoma City Suburbs


    I've always run Mobil 1 in my vehicles. No problems yet.

    Here's another good site you might check out:
    2008 Chevy Tahoe
    2007 Nissan Titan CC
    1997 Chevy 1500 EC (just passed 200,000)

  4. #14
    Sr. Apprentice
    Join Date
    Oct 2007
    Houston, TX


    Bought our 1990 GMC Suburban in 1996, when it had 100,000 miles on it. I immediately started using Mobil 1 synthetic oil, and started using a 2 quart oil filter. It has 336,000 on it now, and believe it or not, that engine doesn't burn nor leak a drop of oil! I have put two transmissions and two rear ends in this vehicle, but have only changed plugs, wires, distributor cap, and oil and never have had a problem with the engine.
    1990 GMC Suburban 329,000 miles

  5. #15


    Amsoil is definetley good but royal purple is just as good or better i use it in my crankcase with 170000 miles and the rear end i'm about to put it in the tranny. When i changed over from regular gear oil to royal purple 75 90 in my rear end i got 1.5 more mpg average that is just rear end oil!

  6. #16

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    The old man just started using synthetic in his NBS 07 with the 6.0 max, he has seen a 1.5 mpg raise! And considering how ling you can go on synthetic and how many miles a year he puts on he will only need two changes a year and save a ton of money
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

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