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If you mean what can cause smoke coming through the exhaust it could be a number of things. The two worst possibilities are your valves are shot or your piston cylinder walls and rings are worn and you are getting oil blow by. A valve job will be around $1300 for a straight 4 cylinder and if you have a V6 or V8 with two heads you can double the cost. Bad cylinders will require an engine rebuild and will probably be cheaper to find a used good engine for around $800 and another $800-$1000 to put it in.

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