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  1. #1
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    Member No: 34931 Heine is an unknown quantity at this point Heine's Avatar
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    Yes | No

    Royal Purple Trans/Gear oil

    I used Royal Purple Synchromax in my E39 540-6 & was happy with it.
    I get conflicting input on their transmission oils for my E34///M5.
    One rep states to use Synchromax for transmission & Gearmax 75w90 for differential.Another states Gearmax 75w90 for both.

    In Roundel Mike Miller dismisses the product,because the name reminds him of a candy or drink from the old fasioned soda fountain shop.

    What is the right RP product for this application.

    Regards
    Heine
    '91///M5 Blk/Blk Coming out of winter storage.

  2. #2
    Prairieman
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    Re: Royal Purple Trans/Gear oil

    that depends on what viscosity oil is prescribed for the E34 M5 5-speed gearbox. My M5 has the Getrag 280 6-speed which calls out ATF as the proper lubricant. Poyal Purple specifies their synchromax product for manual gearboxes using ATF.

    I thoroughly Mike Miller's column, but disagree with his assessment of Royal Purple products. I'm a happy customer..

    Brad
    1979 635CSi
    1981 745i
    1991 M5
    1992 735i

  3. #3
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    Member No: 77938 cchase009 is an unknown quantity at this point cchase009's Avatar
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    Re: Royal Purple Trans/Gear oil

    If you can't find Royal Purple...look @ BG SynchroShift II for the box and BG 75/90 with LSII for the diff.

    C. Chase
    '91 M5

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