A used-car buyer's guide to the R55/R56/R57/R60 MINI Cooper S with the N14 or N18 turbo: timing chain, carbon, oil leaks, water pump, thermostat housing and clutch, with real repair prices.
Covers: MINI Cooper S hatch, Clubman, convertible and Countryman, roughly 2007–2016, with the 1.6 turbo N14 (earlier) or N18 (later).
A Cooper S is a blast to drive and cheap to buy for a reason. The N14 in particular earned a rough name: timing chains, carbon, oil leaks and cooling parts. The later N18 is better but not perfect. Buy one with records and you'll probably be fine. Buy one without and budget like you mean it.
What to look for
- A rattle on cold start that lasts a few seconds (timing chain and tensioner).
- Oil leaks around the oil filter housing, valve cover and turbo oil lines.
- Coolant leaks from the thermostat housing or water pump, and any low-coolant warnings.
- How much oil it uses between changes.
- Rough running or misfires, often carbon buildup on the intake valves.
- Clutch slip, chatter or a noisy dual-mass flywheel on manual cars.
- Whether it's an N14 or N18. The engine code matters for what to expect.
Problems by mileage
Roughly when owners and shops report each problem. Plenty of cars go longer and some fail sooner, so use this to know what to ask about, not as a schedule.
Rough idle, misfire, hesitation.
Rattle for a few seconds on cold start ("death rattle"), timing codes.
Coolant leak, sweet smell, temp warning.
Oil smell, drips, wet engine.
Low oil warnings between changes.
Full MINI N14 / N18 problem list with what each fix costs →
Repair costs to budget for
Only jobs we have cited owner reports for. If a job isn't here, we don't have enough real prices for it yet.