Hey all,

My oil dipstick is slightly above the upper notch on my 616 and I'm wondering if that could cause blue smoke at startup? Believe it or not, it doesn't seem to be consuming much oil at all.

Thanks

The effect of bad valve rubbers is not reported often. Yet there are a few cases where the poster stated his diesel smoking at startup was improved by changing them.

At the same time remember some have changed them with no apparent difference. Drop you oil level to mid way between the marks and see what happens first. You could be splashing so much oil on the walls the rings will not scrape down enough with a high oil level.

Are you sure the smoke is blue? An injector leaking down at rest will cause some smoke on startup but that should be blackish I believe.

Well thanks for your reply.

I would say that I am 98% sure it's blue. It's just funny that my oil level doesn't seem to drop much if at all!

Beware of overfilling, as crankcase vents can get pushed up in to the intake; I had a minor runaway that way one time.

Also be aware of the possibility of fuel dilution which might make the CC level seem constant when in reality some is slipping by the piston rings and being replenished by dilution.

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Retired Marine Engineer
2005 E320 CDI
1987 300 Turbo Diesel @ 300,000 kM going
1974 240 D 300,K Miles when given away gone
1970 200 D gone
1969 190 D gone

I dont think slightly over full oil pan would cause blue smoke at startup.

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-->1971 mercedes 220D; 617 951 engine, 4 speed