All BMW 12 cylindder engines were infamous for frequent and very very expesnisve gasket leaks.Also pre mature cam wear I am unsure which model year these problems were fixed (if ever).
If you go on the BMW forums you will get an earful about that.This question has come up beforre because the kind of folks that like Q's are also liely to like 750's.
Its a better looking macheen but that's all thats in its favor.
There was a guy on a BMW forum who spent $15,200 (fifteen thousand) in 2 years on maintenance and wasnt done yet and hadn't even addressed the cams.
There are a couple of lemon sites deidcated to this car.
I know its kinda sad to hear this, about the 750, I remember eagerly reading gushing reviews on it, when it was new.
But it'll make a first gen Q, look like a Civic when it come to cost of ownership.(and a 97 is of course less to maintain than a first gen)
The cost of ownership/reliability of a older 750i may possibly be worse than jaguar in its bad old days.
Fred...
