What does it mean when GREY smoke comes out of your exhaust?

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asked Jun 7 in Other-Cars/Transportation by Thoysome (540 points)
What does it mean when GREY smoke comes out of your exhaust?

1 Answer

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answered Jun 7 by Grahlu (15,960 points)
Having Gray looking smoke coming out of your tailpipe can mean a number of different things.

In most cases Gray looking smoke coming from your exhaust is usually caused by your cars engine burning the oil or even could be a problem with the vacuum modulator on your automatic transmission allowing transmission fluid to enter your engine.

Another thing that can cause Gray smoke is a stuck or faulty PCV valve "Positive Crankcase Ventilation"

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