First off I apologize if I placed this in the wrong section, it's my first post as a new member. I'm looking to change my transmission fluid on my 2002 m3. There are numerous posts of people using redline and royal purple fluid vs oem fluid. Anyone have any imput on this? I have noticed my gears have been notchy and at times hard to shift Into first gear on a cold start up. Is this normal? My m3 has 36xxx miles.