if its coming from the exhaust than its a internal problem though i could be wrong, since im no mechanic lol, usually it also depends on the color of smoke, white indicating a gasket problem, bluish smoke the pistons rings are on there way out or seals are gone, and black smoke obviously ecu running rich a/f mixture
could also be a worn seal making it leak somewhere, are u loosing oil? and how much are u loosing?
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