We have a '93 300TE 4Matic. At about 150M miles I noticed an increase in oil consumption. Our indy thought it was valve seals and changed the seals by using air pressure in the cylinder to hold the valve up. He did not remove the head. That solved the oil problem. We have 272M on the car now and it still runs great. We have a small amount of oil leakage through gaskets but I have not changed the valve cover gasket since the valve seal work. The head has never been off.

SRHARVEY
'93 300TE 4Matic, 272M
'83 240D 250M
'82 380 SL 130M