Internal and External engine oil & coolant leaks can develop from the head gasket and/or timing cover gasket; these leaks should be repaired before the engine oil and coolant intermix which can result in severe engine damage.
Car Problem Reports
Mercedes-Benz SL320 Repair Leaks From Head Gasket/Timing Cover Gasket Before Oil and Coolant Intermix
Mercedes-Benz SL320 Problem
Visitor, 1995 Mercedes-Benz SL320, 80,000 mi
leaking water externally... Add that issue to the crappy insulation falling off the wiring harness and I would have been better off buying a FORD