Recently purchased 2012 C63 from FL. No coolant loss no warnings no overheating. But after arriving home to change the oil ..boom. Coolant. changed it out. Still coolant. Engine tear down...the newest headbolts were used. Bolts didnt snap.Gaskets didnt look bad. No warps/cracks in heads or engine block. I will note: car was previously used for racing with wet nitrous and a tune.so... possibly lifted head/stretched bolt gave way thru MLS gasket.rebuilding as we speak.. Will let you know how that goes after $3100 in parts replacement.

Oh ouch! Good luck with repairs.

Hope you got it at a price that was worth the hassle and time you’re going to spend on it now. But they say Nothing is more expensive than cheap Mercedes. Good luck !