Why is white smoke coming from the exhaust of a diesel vehicle?

1 Answers
CaliMarie
07/29/25 10:46pm
White smoke occurs when the high-temperature exhaust gases from the tailpipe cause water vapor to condense into tiny water droplets. If the smoke is excessive, it may indicate damage to one of the engine's pistons, leading to oil burning. The thick white color in the exhaust is naturally due to a high water content in the exhaust gases. There are two main causes for this phenomenon: 1. Excessive water content in the gasoline; 2. Damage to the sealing gasket of the water channel or cylinder liner, allowing coolant to enter the cylinder. High-temperature gases from the cylinder can then leak into the oil pan, contaminating and thinning the engine oil, which affects lubrication performance. The hazards of this issue are obvious. Therefore, when adding engine oil, it is essential to follow the recommended quantity.
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