What Causes a Car to Emit Large Amounts of White Smoke from the Exhaust?

[MacSadie]

There are several reasons why a car emits large amounts of white smoke from the exhaust: 1. White oil mist: The main reason for milky white oil mist being emitted from the exhaust pipe is poor fuel vaporization, where the fuel is expelled from the exhaust pipe without burning, forming a milky white smoke. This is more common when starting the engine in winter due to low temperatures causing poor fuel atomization. It usually disappears as the engine temperature rises after starting. If the exhaust pipe emits black smoke after the engine warms up, it indicates low cylinder pressure or a non-functioning cylinder, which should be checked and addressed. 2. Water vapor white smoke: The emission of large amounts of water vapor white smoke from the exhaust pipe, with water droplets at the exhaust pipe outlet, is mainly caused by coolant leaking into the cylinder or water content in the gasoline forming steam. Check if the cylinder head gasket is damaged, if the cylinder block has cracks, or if the cylinder sleeve seal is intact, among other issues.