[Watsey]

With a full service history from a BMW main dealer or a quality indy the car should be fine.

Having just had the inlet ports and inlet manifold cleaned on my car (80K miles) I'd recommend having that done as the carbon deposits really do build up over time. Should be £300-350.

Apart from that, it's a question of doing all the normal checks pre-purchase : no smoking from the exhaust, smooth running, gearbox modes all work, electrical components all functioning, etc. Check the MOTs for advisory notes and receipts for any rectification works.

A modern car, well looked after, should effectively last forever if required. Things occasionally stop working, but the money saved versus the purchase/deposit/monthlies for a new car should easily offset that.