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  1. #1
    Join Date
    Nov 2018
    Location
    CT
    Posts
    76

    Default Final Drive/Rear Diff Oil Type

    Hello everyone,

    I’m gearing up for a weekend of wrenching and I want to make sure I have everything I need. I’m working on changing the Haldex fluid, cleaning the pump, and changing the filter.

    I figure while I’m back there it’s probably time to replace the final drive/rear diff fluid as well. So the question is: Does the rear diff take the same oil that the bevel/angle gear at the front does?

    Appreciate any tips as well. I know I won’t be able to extract all the old fluid. Is this a case of take what you can, fill until it drops from the hole, and call it a day?

    Thanks!

  2. #2
    Join Date
    Feb 2010
    Location
    Virginia Beach
    Posts
    4,116

    Default

    A couple of thoughts:

    Any good synthetic 75W90 is fine. I like Mobil 1, mostly because it's about $11 for a quart at my local store.

    Get the differential warm (highway drive) before doing this. With warm fluid, you'll get better removal.

    Use a vacuum pump/extractor.

    A regular hose won't fit. Use a very thin, hard line, like a nylon vacuum line (4mm Mercedes line is what I used), it's the only thing that will get to the bottom of the differential.

    Wiggle and move the line to get it fully inserted. If it binds when you pull it out, twist and re-insert just a bit to free it up. Pull too hard, you'll break the line, and then you've added debris to the differential.
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (126K, Michelin AS4, HPL 0W40)
    2005 MB SL600 (55K Michelin AS4, Mobil 1 0W40)
    2004 V70R (143K, six speed M66, HPL 5W40)
    2004 XC90 (235K, HPL 0W30 Euro)
    2002 V70-XC (295K, HPL 0W30 Euro)
    2002 V70-T5 (225K, IPD bars, Bilsteins)
    2001 V70-T5 (125K, IPD downpipe, cat back and other mods)
    1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)

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