Is It Normal to See Smoke When Opening the Oil Cap?

[BrynleeMarie]

If a small amount of smoke appears when opening the oil cap, this is a normal phenomenon—it is oil vapor. More related information is as follows: 1. When a car engine is running, the temperature is relatively high, causing some of the oil inside the engine to form oil vapor. If smoke appears when opening the oil filler cap immediately after driving, this is normal—the smoke is essentially oil vapor. 2. Engine oil is crucial for the engine, as it serves functions such as lubrication, cleaning, cooling, and sealing. Engine oil is often referred to as the "blood" of the engine. Without oil, the engine would not function properly. Car owners need to change the engine oil regularly, even if they drive less frequently. If oil remains in the engine for too long, it can deteriorate. 3. Engine oil consists of base oil and additives, which enhance its performance and shelf life. Common additives in engine oil include dispersants and antioxidants. For most household cars, the oil should be changed at least twice a year.