Reason notice fresh oil smell, coasting to a stop. Perfect engine braking.M104 maybe oil pipe from crankcase.never lose oil.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt

Leaking valve guide seals would pull oil into the combustion chamber. You'd be smelling burned oil out the tailpipe. A "fresh oil" smell would suggest a valve cover gasket leaking.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]

well smell at rear of car. are they rubber?

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt

Viton........

Those produced in France are made from Roquefort; those made in Germany and Belgium are made from Limburger; and the Moon is made of ...., well, we all know.

I believe valve seals are made from neoprene rubber.

so they could crack from age,and not wear?

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt

I would guess the cracking comes more from heat and age, not wear.