Many reasons; check your oil.
valve seal
the smoke that comes out of a exhaust pipe is supposed to be white
white smoke is coming from my exhaust why?
Telltale sign is WHITE smoke coming from the exhaust that smells like Antifreeze.
Engine exhaust turns white from water in the combustion chamber.
possible blown head gasket. I don't get white smoke from my exhaust! is it from yours? If it is just after you start your car it is normal.
It is buring oil this is a wrong answer whe engine burn oil to the exhaust smoke is a heavy white smoke no black
White smoke from the exhaust indicates that your car is burning water in the combustion chamber. This is an indication of a bad head gasket.
White smoke is a sign of excess fuel or running "rich".
White smoke means head gasket, cracked head or equivelant.
is there white smoke coming out the exhaust? if so you need to replace the head gasket. if no white smoke then you might not be getting enough fuel then you might want to change the fuel filter
white smoke from diesel exhaust generally means you have engine coolant leaking internally in enginevery rarely , white smoke can indicate a problem with the turbo