How do you refill the automatic gearbox? ZF 4HP22. Can you fill through the dipstick, then recheck level? Recomended oil?
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
Refilling this on the original «life-long» oil will not cause issues? Iguess its better than running dry😅.
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
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.
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