The reasons for gas/smoke coming out when opening the oil cap while the engine is running are usually as follows: 1_ Blow-by gas Some compression gas enters the crankcase through the piston ring and cylinder This gas is more when the engine is old or the piston ring is worn So when the oil cap is opened, gas comes out due to pressure 2) PCV valve problem If the PCV (Positive Crankcase Ventilation) valve is not working The crankcase gas cannot come out properly As a result, gas comes out forceful
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