Is It Normal for a Car's Exhaust Pipe to Leak Water?

[JeffreyRose]

It is generally normal for a car's exhaust pipe to leak water, but there are exceptions. After normal combustion, a car produces carbon dioxide and water vapor. When the water vapor condenses, it forms liquid water. When the amount of water vapor reaches a certain level, it is expelled through the exhaust pipe. Some cars are designed with drainage holes in the exhaust pipe to allow this water to exit. However, if the owner notices water droplets from the exhaust pipe forming clumps on the ground or the exhaust appears as a milky white oil mist, this indicates abnormal leakage and requires the owner to check whether the engine's coolant level is abnormal.