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What causes blue exhaust smoke?

Updated: 12/14/2022
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Wiki User

11y ago

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The blue smoke you are referring to happens when a car piston rings become hard or aged or you ran it out of oil causing the rings to be messed up. And the oil is being drawn up past the rings in to the cylinder and being burned when the firing sequence is in its combustion stage. That is most likely the cause. If its just a puff of smoke when you start your vehicle its possible that your valve guides are worn. So when you shut off your vehicle oil will leak past your valve guides and sit in top of the valve until the vehicle is started then the valve opens and the oil gets into the cylinder being ignited. it usually stop when driven a little. Always always always check your oil. The miles on a car don't matter only if you have kept that oil changed.

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11y ago
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Q: What causes blue exhaust smoke?
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