the mechanics do it for you, i could have on mine but didn't want to attempt it. i know on e30's bmw reccomonds lifter adjustment every 60-75k miles, figured the same applied to some of the newer m50's as well.
may not be the problem, just a thought, i'm not an e36 guy lol.
R.I.P fast 6
Two wheels or Four, I'm happy as long as the throttle is pinned.