There is a short-term solution: Used one of these high-mileage oils (made for cars over 75,000 miles) Valvoline MaxLife or others. Try this through one oil change interval. You will need to adjust the valves regardless if you do the valve stem seals.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)