: V8 models are notorious for valve stem seal failures (look for smoke after idling) and oil leaks from various gaskets. Even a "minor" leak in these cars can be costly to fix due to limited engine bay space.
: Often cited as the "safest bet". The N52/N53 engines are reliable and easier to maintain than the V8 alternatives. buy used bmw 6 series convertible
: Offers massive power and a great soundtrack but comes with higher risks of expensive oil leaks and cooling issues. : V8 models are notorious for valve stem