Im looking to buy an E34, ideally an M50 520 or 525. just after a list of things that are likely to ruin the ownership for me. the wife insists that the car must last more than 12 months and not need major money spending on rectifying inevitable faults so what is likely to go wrong,what do i want to look for when viewing.

I remember hearing that the water pumps need to be replaced for metal impellored ones but is there anything else?