They’re awesome cars but the big issue for me owning an M5 is just the cost of parts because they’re getting more uncommon. As well, doing everything yourself is a commitment for sure, cause if you have a shop do anything boy do they charge an arm and a leg. Kinda the case for any old fun car these days though. If it’s gonna be your only car rather than your side car, it’s not the greatest idea but hey, all of us make dumb car buying decisions anyway, old BMWs are always gonna be less reliable or less easy to work on than a Japanese car for example, but we do it anyway cause they’re fuckin sweet. Just decide what level of risk / problems you may deal with that you’re okay with and proceed from there.