Is it normal to have milky white impurities on the oil cap in winter?
1 Answers
In winter, the presence of milky white impurities on the oil cap needs to be judged under two circumstances. If the fuel consumption is within the normal range and there is no abnormal loss of coolant, it is a normal phenomenon. However, if the fuel consumption is abnormally high and accompanied by a lack of antifreeze, it is an abnormal phenomenon. Normal phenomenon: In cold weather or when driving a cold vehicle, the engine does not reach its normal operating temperature, and the air-fuel mixture does not burn completely, producing a small amount of water vapor. When mixed with the engine oil, this can lead to milky white impurities on the oil cap. This is a normal occurrence and does not significantly affect the engine. Simply wipe off the milky white impurities. Abnormal phenomenon: Damaged cylinder head gasket, cracked cylinder liner, large amounts of gasoline leaking into the engine causing antifreeze to enter the lubrication system, or high-pressure fuel pump leakage. Unscrewing the oil cap will reveal a large amount of milky white impurities, which are also present inside the engine. In such cases, it is necessary to take the vehicle to a repair shop for maintenance, including replacing the cylinder head gasket, high-pressure fuel pump, cylinder liner, and other components.
