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Thread: Differential Oil

  1. #1
    E500E Guru mistermiata's Avatar
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    Differential Oil

    Hi Guys....

    Quick question. I will be changing my rear diff oil soon. Went to the local AutoZone, and they didnt have the exact diff oil as specified in my owners manual (85w-90). Is it ok to use the Mobil 1 synthetic in 75w-90 they had at AutoZone?

    TIA!

    Andy
    Andy
    94 E500
    (128k miles)....sold
    2000 Land Rover Disco (112k miles)
    95 Mazda Miata (104k miles)
    91 BMW 325i (140+K miles odo broken!)

  2. #2
    .036 Hoonigan™
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    Re: Differential Oil

    Yep, that should be fine. It uses 1.3L so make sure you get two bottles.

    Dave M.
    1997 E420 (Bugeyes)
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  3. #3
    E500E Guru mistermiata's Avatar
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    Re: Differential Oil

    Got it. Thanks Dave!
    Andy
    94 E500
    (128k miles)....sold
    2000 Land Rover Disco (112k miles)
    95 Mazda Miata (104k miles)
    91 BMW 325i (140+K miles odo broken!)

  4. #4
    Senior Member Eno's Avatar
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    Re: Differential Oil

    Can anyone advice if possible on the correct rear differential oil for a 1992 500E?
    About a year ago I was given this below oil for my differential: A 001 989 33 03/12
    IMG_5830.JPG

    Today, for my other 1992 500E I was given this below differential oil: MB235.0
    A 000 989 28 03/BGA6
    IMG_5862.JPG IMG_5863.JPG

    I insisted that it was not the same as last year and they (MB Official Dealer) told me as per below specs sheet is ok.
    I am a bit confused.
    IMG_5871.JPG




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  5. #5
    .036 Hoonigan™
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    Re: Differential Oil

    It appears the original gear oil was 000-989-28-03, which has been superceded to 000-989-28-03-BGA6. From what I can tell the preferred spec sheet is 235.7 but 235.0 is also acceptable. The previous stuff you had (001-989-33-03-12) may be preferable but I have no idea what the difference is between the two. The 235.0 fluid they provided should be fine. Is the 235.7 fluid not available?

    FWIW, I generally use aftermarket full synthetic, either Red Line 75W-90 or Amsoil SVG. However, these do not work well with the original rear cover sealant (Hylomar) and can cause a rear cover leak if the cover has not been sealed with a different sealant, preferably the newfangled MB black stuff (Loctite 5900 or Permatex Right Stuff).


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  7. #6
    Senior Member Eno's Avatar
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    Re: Differential Oil

    Thanx a lot Dave, I appreciate your time and clear explanations/feedback.
    I was worried, so both are OK I guess.

    What made me worried most is that the gear differential oil (000-989-28-03-BGA6) did not mention the thickness of the oil in the box.
    About the below brands I have not seen them here where I live.



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  8. #7
    .036 Hoonigan™
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    Re: Differential Oil

    Quote Originally Posted by Eno View Post
    What made me worried most is that the gear differential oil (000-989-28-03-BGA6) did not mention the thickness of the oil in the box.
    You are right! That is so strange - I've never seen that before. I didn't catch that the first time...


  9. #8
    Senior Member kwontumspeed's Avatar
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    Re: Differential Oil

    Hey Andy, I have the correct rear diff synth oil in my garage. Brand new, along with a pump lid I bought online. I'll send it to you gratis if you PM me your address. I was going to do it myself by had the shop do it while it was in for another reason entirely.

  10. #9
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    Re: Differential Oil

    I'd be surprised if you could go wrong with any synthetic GL5 gear oil. MB's latest spec is 75w85(redline meets 235.7) which is to be more fuel efficient but still meets GL5. I think similarly new trans fluid is D6 which holds a more constant viscosity than D3-4 stuff.
    I would use 75w90 and not the reduced friction formula in our cars. I think several run the high-shock.

    I use the redline in my limited slip diff.


    M
    Last edited by samiam44; 04-12-2017 at 09:12 AM.

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