Emissions and Exhaust Systems
Mufflers and Tailpipes

What causes gray smoke from the exhaust?

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Answered 2007-07-02 18:35:14

Blue/grey smoke is usually oil. White smoke is usually coolant in the exhaust. IE: blown head gasket or something. note: if the smoke goes away after it runs for a minute it's oil runnung down the valves when it sits. Common problem, won't hurt anything.

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