My plugs look fine, and with very little oil consumption (about 1/2 quart per 3000 miles) valve stem seals do not seem to be an issue.
The fuel mixture at start-up seems to be more of the problem, but since my 2nd tries are always 100% and the engine runs beautifully once at idle, I'm not going to sweat it much. I'll see what happens once the weather gets a little cooler here...
'92 190e 2.6
'91 190e 2.6