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Under what driving conditions does it blow the smoke? White smoke indicates coolant entering the combustion chamber either by head gasket, crack in the head, block, or entering in by the intake manifold. Take the spark plugs off and see if there is any sign of coolant on them. Probably do a compression check... or my favorite is a cylinder leakage test.
This is assuming that it isn't normal vaporizing condensation in the exhaust.
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