E-Class (W210) 1995-2002: E 200, E 220D, E 240, E 290TD, E 300TD, E 200, E 240, E 280, E 320, E 420, E 430 (Wagon, Touring, 4Matic)

Blue puff on start

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Old 05-06-2010, 10:47 PM
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MG
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1998 E430; 2007 Porsche 911 C4S Cabriolet; 2011 Expedition EL Limited; 2014 E350 Estate
Blue puff on start

had this for nearly two years. I was told that my valves were probably wearing, which was hard to believe with barely 100k on the odometer at the time it started. It really wasn't burning oil so I lived with it, as annoying as it was.

Took my car into a new mechanic for an oil change and he noted oil down the side of the filler tube and side of the engine. I assumed it was sloppy mechanics spilling it. He said my oil filler cap was worn out and replaced it. He told me the compression loss was sucking oil up into the valves causing it to ignite on start.

4k miles later, no more blue puffs.
Old 05-07-2010, 11:00 AM
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'01 W210 E320 CDI
Hmm, the gasket of my oil-fillercap is also worn out and I have some strange 'sweating' of oil so I'll also give this a try...
Old 05-07-2010, 03:42 PM
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John Deere
How'd you find this mechanic? Sounds good.
Old 05-08-2010, 12:00 AM
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MG
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1998 E430; 2007 Porsche 911 C4S Cabriolet; 2011 Expedition EL Limited; 2014 E350 Estate
some guy told me about him.
Old 05-08-2010, 12:53 AM
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Originally Posted by MG
some guy told me about him.
Some dumb bum, no doubt.
Old 05-09-2010, 10:05 PM
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Nice wife, cute children, still not too sure about him.

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