Problems with the e60 m5's are rare ive had mine 2 years now and only had to replace the vanos solenoids on the left bank (£700) but was done under warranty. fantastic car most things on the road cant touch it even some superbikes struggle especially on dual cariageways and motorways and even better with the tc off lol better off buying one with about 40k miles on it just make sure tyres and brakes are decent when you buy one best car ive ever owned mate