Is it normal to see slight white smoke when opening the oil cap?

1 Answers
FaithAnn
07/29/25 3:14pm
It is normal to see slight white smoke when opening the oil cap. The reason is water vapor that enters during combustion, which is the high-temperature evaporation of oil in the crankcase and crankcase blow-by gas, also known as crankcase vapor. However, if there is a lot of smoke, it is not normal and may be due to the use of inferior oil. Oil, or engine lubricant, serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption for the engine. Qualified oil can reduce wear on engine parts and extend the engine's service life. There are three types of oil used in cars: mineral oil, semi-synthetic oil, and fully synthetic oil.
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