Genuine BMW part 17 20 1 728 770: Oil cooler-plug type connection. The number stamped on the part is 17201728770; BMW's catalog files it under the short number 1728770. You will find it on our Cooling System shelf, under Expansion tank. It supersedes the older number 1723982, so a part carrying that number is the same part.
It fits every E36 body style (318i, 318ti, 320i, 323i, 325i and 328i, 1992–1999), with the M40, M42, M43, M44, M50 or M52 engines — and the European-market versions.
BMW draws it on 3 diagrams, among them Transmission Oil Air Cooling (17_0095) and Transmission Oil Air Cooling (17_0600). It weighs about 720 g (1.6 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.
