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That would depend on the color of the smoke:

Light blue-gray smoke is due to oil getting into the combustion system, usually due to worn piston rings or valve seals.

Black smoke is due to the engine burning too rich, usually due to fouled or faulty spark plugs or a clogged fuel filter;

White smoke (steam) is usually due to condensation inside the exhaust, or coolant entering the combustion chamber. If the white smoke disappears after a few minutes, it is only condensation and not a cause for concern. If it does not disappear, the problem may be a blown head gasket or a cracked cylinder head.
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15y ago

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