What Causes Oil Leakage from the Engine Cover?

[JuneLynn]

Engine cover oil leakage can be caused by the following reasons: The causes of engine cover oil leakage include damage to the oil pan, loose or stripped drain plug, and excessive crankcase pressure. Damage to the oil pan: Since most vehicles have relatively low ground clearance, if the driver operates the vehicle on rough or uneven terrain, the oil pan is highly susceptible to damage from scraping against the ground or being struck by flying debris. As the container that stores engine oil, any damage to the oil pan will immediately result in oil leakage (most oil pans today are made of aluminum alloy, though some are constructed from stamped steel plates). In this case, the oil pan needs to be replaced. Loose or stripped drain plug: If during an oil change or routine maintenance, the drain plug becomes loose or stripped due to negligence or improper handling by the technician, the engine will inevitably leak oil. In this scenario, the drain plug needs to be tightened. Excessive crankcase pressure: When too much oil is added or when the crankcase ventilation system fails, allowing mixed gases from the cylinders to accumulate continuously, the internal pressure of the crankcase rises excessively. This high pressure forces oil out through the seals, causing leakage. In this case, the crankcase requires repair.