I was wondering if a 1987 300D is supposed to emit smoke when it is idling after it has warmed up? One of the past 300D's I looked at seem to emit a small amount of soot at idle even after warming up. I know there is supposed to be some smoke at idle when the engine is cold.

Is there any time a 300D should smoke or is it fairly clean burning? (like during hard acceleration?)

Thanks in advance.

-Steve