Oil and coolant leaks around the hot vee (S63)
The turbochargers sit inside the V of the engine, and years of heat harden the valve cover gaskets, the seals on the turbo oil lines and the plastic coolant pipes around them. Specialists report oil line seals weeping from around 60,000 miles and coolant pipe leaks later. Left alone, oil drips onto hot exhaust parts and coolant loss can overheat the engine.
How to check
Look under the engine cover and beneath the car for wet oil or dried coolant, check for a burning-oil smell after a drive, watch the coolant level, and ask which gaskets, lines and pipes have been replaced.
