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.Google+
Car Problem Reports
Mercedes-Benz 300SL Repair Leaks From Head Gasket/Timing Cover Gasket Before Oil and Coolant Intermix
Mercedes-Benz 300SL Problem
Average Mileage: 107,500 mi (70,000 mi - 145,000 mi)
Visitor, 1991 Mercedes-Benz 300SL, 70,000 mi
Oil leak from head gasket and timing cover gasket. Replaced both.