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Thread: 730i gearbox refill?

  1. #1
    Join Date
    Jan 2020
    Location
    Norway
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    5
    My Cars
    1990 730i

    Lightbulb 730i gearbox refill?

    How do you refill the automatic gearbox? ZF 4HP22. Can you fill through the dipstick, then recheck level? Recomended oil?

  2. #2
    Join Date
    Nov 2005
    Location
    Quebec Canada
    Posts
    1,319
    My Cars
    92 735iL (12/1991)
    Hi, for the 4HP22 you refill it through the dipstick tube. It is a small opening so use a suitable funnel.

    Oil should be Dexron III. Castrol Transmax Dex/Merc is a suitable oil.

    90,700 miles 1992 BMW 735iL Azure Blue Metallic with Silver Grey leather interior ‣My car ‣My YouTube channel

  3. #3
    Join Date
    Jan 2020
    Location
    Norway
    Posts
    5
    My Cars
    1990 730i
    Refilling this on the original «life-long» oil will not cause issues? Iguess its better than running dry😅.

  4. #4
    Join Date
    Nov 2005
    Location
    Quebec Canada
    Posts
    1,319
    My Cars
    92 735iL (12/1991)
    I changed the filter and oil of my transmission (4HP22 as well) and my car has 90k miles.
    I believe it had the original filter and oil, car runs fine now.

    90,700 miles 1992 BMW 735iL Azure Blue Metallic with Silver Grey leather interior ‣My car ‣My YouTube channel

  5. #5
    Join Date
    Jan 2005
    Location
    Japan
    Posts
    54,655
    My Cars
    11/88 E32 750iL+98 E36M3
    Fluid level checking is shown here, must be done with engine running https://www.bimmerforums.com/forum/s...lication-Chart
    You can add some fluid to the original fluid, but better make a fluid and filter change after so many years.
    Shogun tricks and tips for the E32 series are HERE!

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