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Chris, Auto Service Technician
Category: Car
Satisfied Customers: 13873
Experience:  43 years of automotive repair, Smog license
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What causes blue/ smoke?

Customer Question

what causes blue/white smoke ?
Submitted: 2 years ago.
Category: Car
Expert:  Chris replied 2 years ago.

Hello and welcome to just answer. blue/white smoke is caused by engine oil getting into the cylinder(s). Common causes are 1 worn piston rings, 2 worn valve guides and/or valve stem seals, and 3 a PVC valve that is stuck open. Excessive or diluted engine oil can also contribute to blue/white smoke.