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  1. #1
    Join Date
    Sep 2010
    Location
    Alexandria, KY
    Posts
    382

    Compatible 75w-90 differential oil?

    My local autoparts house carries Mobil 1 and Valvoline Synpower 75w-90 weight synthetic gear oil. Are these equivalent to use in the front and rear 2500 American Axle differentials?
    2009 - 2500 Dodge CTD, QC, SLT, 4x4, 3.73 gears. all stock
    1994 - Airstream Excella Classic 31' travel trailer
    1990 - Jeep Grand Wagoneer - Sunday Driver
    1986 - Jeep J20 - gone but not forgotten
    2002 - Jeep Grand Cherokee - daily driver for the wife

  2. #2
    Join Date
    Dec 2002
    Location
    Spokane WA
    Posts
    3,694
    I looked up the spec information in the service manual I have for my truck and looked for that compliance on the label of the oil that I purchased. . . Each time I've gone back to purchase more. . . I buy the same brand. .

    I would think that both brands you mentioned would comply, what do their labels say. . .
    Jim



    Retired Roaming America, 05 3500 4x4 Dually Molten Red stick, 125K miles, PacBrake Exhaust Brakes, 05 Jeep Grand Cherokee Limited, 05 Honda Rincon 650 ATV, 2001 Honda Goldwing

  3. #3
    Join Date
    Sep 2010
    Location
    Alexandria, KY
    Posts
    382
    Yep - did some more research and both are API GL5 rated which is what is needed.

    I probably thought too much about this and noticed the spec on an old Mopar branded 75w-90 container was MS-9763. I believe this spec is for the 1/2 ton axles. Neither brand mentions meeting this specification.
    2009 - 2500 Dodge CTD, QC, SLT, 4x4, 3.73 gears. all stock
    1994 - Airstream Excella Classic 31' travel trailer
    1990 - Jeep Grand Wagoneer - Sunday Driver
    1986 - Jeep J20 - gone but not forgotten
    2002 - Jeep Grand Cherokee - daily driver for the wife

  4. #4
    Join Date
    Jan 2005
    Location
    Ocala,Fl
    Posts
    204
    i sure hope mobil 1 is ok,hate to find out 392,000mi later i am using the wrong oil

  5. #5
    Quote Originally Posted by BLNRAY View Post
    i sure hope mobil 1 is ok,hate to find out 392,000mi later i am using the wrong oil
    Ain't nothin like a little tongue-in-cheek!
    04 quad cab 305 4X4, 48RE, silver Bilsteins, Ravelco, Dynalocks, dash pod with Auto Meter gauges, Unagoose, Mag-Hytec DD trans pan and rear diff cover, Cat fuel filter, Garmon Stage 1 trans, Carli BJ s

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