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  1. #1
    Jeff Bos
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    Weight and type of rear differential oil

    Reading the Bentley, It describes the rear diff oil only as BMW SAF-XLS Synthetic oil. Should we only buy our rear diff gear oil from the stealer or is there an acceptable substitute.

    Thanks

    Jeff
    95 540i6



  2. #2
    kbia
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    I ask at the parts department.....

    they said that the service dept only has it in 55 gal drums. I was going to do mine soon and will use Mobil 1 rear end oil. Or whatever the hell they call it.

    Kbia
    94 540ia


    Reading the Bentley, It describes the rear diff oil only as BMW SAF-XLS Synthetic oil. Should we only buy our rear diff gear oil from the stealer or is there an acceptable substitute.

    Thanks

    Jeff
    95 540i6



  3. #3
    Paul G.
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    80/90 weight from local Walmart. Slick 50 has one


  4. #4
    Brian M.
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    Redline's 75W90 is a good substitute


  5. #5
    Trex
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    What about limited-slip?

    As I recall, the Bentleys book indicates a different type of oil for limited slip differentials. I'm at the office, so I can't look it up. It's in the front of the book, I think around General Maintenance.

  6. #6
    MicahO
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    There are LS/Posi additives-

    You can get them at Pep Boys or other parts stores when you buy your fluid. Most gear oils, like Mobil1 synthetic gear oil, is labeled for use with LS or posi rears, but you still need to buy the additive to avoid chattering rear ends.


    As I recall, the Bentleys book indicates a different type of oil for limited slip differentials. I'm at the office, so I can't look it up. It's in the front of the book, I think around General Maintenance.



  7. #7
    Brian M.
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    use Redline, no chattering, no additives needed


  8. #8
    Tom S.
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    Mobil 1 Synthetic Gear Oil 75w-90


  9. #9
    Trex
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    What? Regular RedLine Hypoid Gear Oil?


  10. #10
    Brian M.
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    nope, just their regular 75W90 gear oil


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