Is the Mercedes C63 AMG reliable?
In the main, the C63 is a pretty bulletproof super saloon and as long as it is well maintined with regular servicing and MOTs, you shouldn't run into any major issues. The V8 engine is highly strung and the early cars did suffer from a common issues which you can read about below.
Parts aren't cheap either but are readily available through both main dealers and independent specialists.
Engine: Carbon can build up on the intake valves of the M156 V8 over time, causing a rough idle or misfire. Before buying, make sure the car has been regularly serviced, and ask the seller whether the engine has ever had carbon cleaning or walnut blasting carried out.
Early models can suffer from rear cylinder head bolt failure, so owners often swap to heavy-duty aftermarket bolts. Watch out for misfires or any unexplained loss of coolant, too. Untoward engine noises could signal a knackered timing chain adjuster or, less likely, worn cam lifters.
Electrics: C63’s relative newness means electrical issues range from potential problems with the infotainment to broken sensors, and most problems will be a specialist repair job. So best check absolutely everything works as it should.
Gearbox: Check for rough shifting and jerky changes: it could be signs of trouble. Fluid and filters want changing every 40,000 miles, and the later MCT automatic has been known to overheat.
Suspension: Worn bushings, control arms and shock absorbers are par for the course. Watch out for any clunking noises or a harsh ride.
