Smoke sometimes - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 04-22-2016, 10:29 AM Thread Starter
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Smoke sometimes

My 75-280s lets out a puff of blue grey smoke
after driving highway speed for about 30 minutes. It only happens when I stop, idle and drive on. But it doesn't happen every time. No smoke at start up or around town driving. It has 106k miles but a real solid motor (inline 6 w/solex carb) Some kind of vapour build up? Valve adjustment? Please send help
Thanks
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post #2 of 4 (permalink) Old 04-22-2016, 12:05 PM
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Gray or blue? Fuel or oil?

Black smoke is fuel/rich mixture

Blue smoke is oil

White or sweet smelling smoke is coolant.

I can't remember what color trans fluid is.

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post #3 of 4 (permalink) Old 04-22-2016, 12:13 PM
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Valve stem seals?
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post #4 of 4 (permalink) Old 04-22-2016, 01:58 PM Thread Starter
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The smoke is more Gray than blue. Definitely coming from tailpipe. It makes a Prius run the other way. valve stem seals sounds a real possibility.
Any other ideas? Thanks guys
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