Camshaft adjuster wear, inherited from the M156
M159First symptoms typically around 60,000 milesA rattle on start-up, or a camshaft timing code.
The SLS engine is a reworked M156 and shares its camshaft adjuster wear. In practice most of these cars cover very little distance, so it is far less often seen than on a C63 - but mileage is what decides it, not the badge. Given what the car is, confirm the diagnosis before anyone opens it.
Parts this needs
Checked against evo.co.uk

