>When diagnosing automobile exhaust smoke, technicians usually refer to the
>vapor from water condensation as white smoke. Oil burning produces a blue
>gray smoke that might be mistakenly called white smoke until you see the
>difference. Black smoke is due to excessively rich fuel mixture. Lawn
>mowers and other air cooled engines cannot produce the so called white >smoke
>caused by water vapor because there is no coolant to leak into the
>combustion chamber and the muffler is too hot to allow water vapor
>condensation. Any "white" or blue gray smoke from the exhaust on an air
>cooled engine is from burning oil.

Kevin,
Most convincing argument and right on. Thanks.
Daniel