Question about 2003 Mercedes-Benz S-Class

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Mercedes w220 s320 cdi grey smoke on hard acceleration

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Unless there are warning lights indicating some sort of mechanical malfunction I would not worry about this. If this were a gasoline engine it would be disconcerting. Diesels on the other hand are more prone to producing soot, and in recent years have come under attack for this reason. The reason this happens is that when you are accelerating hard you are forcing more fuel to be burned in each firing cycle. Soot is simply the product of inefficient combustion.

Posted on Jul 08, 2010

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It may have something to do with the injectors

Posted on Jul 28, 2010

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