I have not heard much positive comments in regards to the automatic transmissions on the 528e models. I own a 1988 528e that was made 3/87 with 150km . Unfortunately there are no records here as to any work done on the transmission before I got the car a couple of years back. The transmission oil looks fine too .Do I have a ticking time bomb here with this transmission ? What is the cost of a replacement/rebuild ? How do I avoid a catastrophe here ? Thanks .