Rear subframe bushings on an e36 are a pain in the butt. I drive a e90 335d(Full deletes and tune) and do all my own maintenance. So far in my year and a half of ownership, it hasn't required anything by VWs didn't. The only e36 M3s with the 286hp I6 were the Canadian Edition 'Euro Spec' models (Which they only sold 45 of in 1997).. If that's a genuine car, make sure the plaque is on the dash
A 1995 e36 M3 has the standard 240hp engine. Great car though, probably one of the best pure driver cars out there.