In Reply to: Checking tranny fluid on a '91 535 posted by George on July 01, 1999 at 00:46:37:
I have a 1991 model 535i with an automatic transmission.
To remove the dipstick, tilt the head of the stick in the direction of the arrow on top of the dipstick. As you tilt the head, pull up and withdraw the dipstick.
Good luck. By the way, I had the same problem. It is embarrasing not being able to figure out how to get the transmission dipstick out.