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When you say service do you mean oil, trans fluid, spark plugs, that kind of crap?
About the smoke, is it slightly blueish, or is it white? Blue smoke is oil burning, in which case the only fix that doesn't involve using oil additives is to replace the piston rings. (also, heavier oils dont burn as much) If the smoke is white, it is anti-freeze in which case you need a new head gasket, and you can't fix that with stop leak or stuff like that.
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