I've got the same tranny, and posted a question a few days ago about this, to which I got a good reply....

It's drained and filled through 2 bolt type plugs around the pan. Make sure you open the fill plug first, to ensure it's not seized or anything. Drain fluid. You can buy a $5 hand pump to fit on the ATF bottle, and use it from under the car to pump fluid back into the fill hole. Follow your bentley manuel, and fill until fluid begins to run out. You're supposed to have fluid temp measurements, and fill w/fluid in a specific temp range...however, I'll drain and fill w/engine(trans) and new fluid at same temp, like first thing in the morning. (assuming the car is in a garage or wherever it would be the same temp as your new fluid...)

Quote Originally Posted by TWISM
Hope you can help me...

I have a 525 TDS (Turbo Diesel Intercooler) from 1992. Because my engine (M51) died a couple of months ago, I have changed the engine. I have an automatic gearbox WITHOUT an oilstick. It is the same as an automatic gearbox from an 525i with M50 engine.

Now is my question, how do I fill my gearbox with oil??

Greetz...

TWISM