ML350 Smokes (Sometimes) - Mercedes-Benz Forum

 
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post #1 of 2 (permalink) Old 03-06-2012, 08:25 AM Thread Starter
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Date registered: Jan 2012
Vehicle: '08 ML350, 99 ML320
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ML350 Smokes (Sometimes)

I have an ’08 ML350 that has a badly worn engine due to lack of oil changes by the previous owner.

During normal driving around town and short runs on the highway it does not use any oil and there is no smoke from the exhaust.

During extended highway driving at steady speeds (60-70 MPH) for more than 10 minutes, oil seems build up somewhere in the engine. Sudden acceleration will produce a huge cloud of smoke from the exhaust. The longer the run at steady speeds, the bigger the cloud of smoke. Additionally, following a very long run, acceleration will cause the engine to misfire and the computer will shut down that cylinder necessitating the engine to be restarted to restore the cylinder.

This only happens following runs at steady speeds.

On a recent trip of 400 miles I used 3 quarts of oil.

Where in the engine, could oil be building up and getting into the combustion chambers during acceleration? Is it possible that it is being drawn into the engine by a defective emission control device?

Wouldn’t worn valve guides cause smoke at start up?

HELP. Nobody that I have consulted including my local MB dealer has been able to explain this.
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post #2 of 2 (permalink) Old 03-06-2012, 11:32 AM
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Date registered: Jan 2010
Vehicle: 99 E430, 01 E430 Sport, 00 SL500
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>>badly worn engine due to lack of oil changes
>>3 quarts of oil per 400 miles
Through the worn piston rings, engine oil escapes into the cylinders to be burned to cause smoke. In rebuilt engine, the rings are often replaced.
What are the signs of bad piston rings - The Q&A wiki
Additionally, the performance will fall off as compression is lost past the worn rings. There... What are signs of a bad piston. Excessive smoke from the exhaust, and an
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