Most likely your head gasket is blown, allowing engine coolant to seep into the combustion chamber and as it burns it burns white. Are you loosing engine coolant with no external leaks.. (no puddles on the ground)? If there isn't any external leaks, and the problem persists, then you need to do a compression test leak down test to verify the problem, and repair it immediately, before there is further damage.
white smoke is coming from my exhaust why?
the smoke that comes out of a exhaust pipe is supposed to be white
NO
It is buring oil this is a wrong answer whe engine burn oil to the exhaust smoke is a heavy white smoke no black
yes.
Could be a diesel? If not then replace your oxygen sensor on your exhaust. A bad oxygen sensor causes the exhaust smoke to be dark in color.
Car maintenance is very important for a smooth ride. When there is white smoke coming out of the exhaust, it is usually an indication of water in the engine.
You may have oil on the exhaust, once this has burnt off the smoke should stop.
Reverse has nothing to do with it, unless the smoke is coming from your differential. White smoke typically indicates you are burning oil somewhere.
Maybe a blown head gasket
yes
Black smoke coming out of the exhaust of a car is usually due to oil being burned in the engine's cylinders. This can be caused by a worn piston ring or rings.