Quote Originally Posted by alan b View Post
635ds are around 10/11k
Ones at that price would have fairly hefty mileage up on them (turbo replacement territory). Let's not forget EGR, DPF, Injector issues etc. all possible too.

Not saying the 630i's are without faults, but of course it all depends on what kind of driving you'd be doing. A lot of urban driving and you'd end up in a world of pain with a 635D realistically......