BMW 535i Sport
I part exchanged my BMW 330i against this car.
I set aside a budget to cover overhauling the cooling system (a common problem with these), however after spending a considerable sum of money on new fans, sensors and header tank, it would still overheat.
On top of this, I discovered that the cam chain tensioners were very noisy (along with the usual V8 oil leaks), so I decided to sell it on.
It was a nice car to drive though, with enough power to hustle along at a brisk pace when required.
Just don't mention the fuel consumption... :-)