Have had my "cream puff" of a 1991 735Il for a week now. All seems great except ....

On 2 or 3 ocassions I have noticed a kick or stumble from the trans. Usually when moving about 40 MPH with minimal throttle. The first time or two I figured it was simply at a speed right between shift points and the trans was hunting for the right gear. Now I am not as certain because ....

This evening I decided to drain & change the trans fluid. I removed the plug and thought, "Wait a minute, did I remove the engine oil drain plug by mistake". The trans fluid was a deep, dark brown, sort of like used motor oil.

Now, the car does have a 1,000 mile powertrain warranty from Mercedes dealer. How much of a stink do I make over this? Since trans still seems to function properly are the obligated to do anything? (I did keep the brown trans fluid in a large jar).

Mike I.