White smoke from the exhaust means two things; excessively rich fuel mixture, or coolant is being burned in the engine. Being that the smoke comes out after 15-20 minutes, the problem is probably an internal coolant leak, allowing coolant to be burned by the engine.
White smoke is coolant entering the combustion chamber. You have a blown head gasket. STOP driving this car immediately or you will destroy this engine. The head gasket must be replaced.
White smoke normally means you are burning oil.
oil getting by the rings causes white smoke and oil dripping out of the tailpipe.
blueish white smoke from the exhaust is your piston rings leaking oil into the compression chamber...
white smoke can be either your car overheating, or smoke from an electrical issue
Sorry to tell you but you have a blown head gasket, cracked head, or both. The white smoke is coolant entering the combustion chamber. STOP driving this vehicle or you will destroy the engine. You must have this repaired and it is not cheap.
White smoke means head gasket, cracked head or equivelant.
blown headgasket
water
blue smoke is oil. white smoke is water. black smoke is unburnt fuel
Quality of fuel plays major role in smoke emission
condensation