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Q: can not find the trans dip stick on 1990 BMW 735iL

where is the trans dip stick
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A lot of "newer" European cars took away the transmission dipstick and sealed the transmission oil level or put the checking method accessible only from underneath the car after checking the transmission oil temperature with a scan tool first. The images I have in a workshop manual I looked at are poor but it does show a dip stick at the back of the engine compartment and the procedure definitely describes checking the fluid level with the engine running in a conventional fashion.
There is a service bulletin that describing an up dated dipstick that is black and cylindrical in design. I hope someone else can give you more specific information. I show the transmission fluid taking Dexron 3 fluid (inexpensive and commonly available).
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