External oil leaks on cylinder head areas SHOULDN'T blocked off! These leaks are due to HIGH oil pressure trying to go somewhere earier than going thru the engine. ON this type of leak the oil will find other places to go & that CAN be into the combustion chambers.
Have seen this happen on several engines & one 1991 350sdl bent a ROD on cylinder due to this!!
Also the head bolts SHOULD never be retorqued as they are STRETCH(torque to yeild) bolts & IF they are loose then the engine has been OVERHEATED.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)