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Analysis of the Causes of Engine Oil Leakage in Cars

2 Answers

Maddox

07/25/25 3:45am

Engine oil leakage in cars can be attributed to the following reasons: 1. Damage or loosening of the oil pan gasket: Oil leakage due to damage or loosening of the oil pan gasket or screws. 2. Missing or loosening of the oil pan drain plug gasket: Oil leakage caused by damage, absence, or loosening of the oil pan drain plug gasket. 3. Improper assembly of the gear cover: Oil leakage due to improper assembly, damage, or loosening of the timing gear cover gasket. 4. Deformation of the engine support plate: Oil leakage resulting from deformation of the engine support plate or inadequate sealing of the gasket. 5. Inadequate sealing of the valve cover: Oil leakage due to poor sealing of the valve cover gasket. 6. Damage to the front and rear crankshaft oil seals: Oil leakage caused by damage to the front crankshaft oil seal or rear crankshaft oil seal. 7. Blockage of the crankshaft rear oil return thread: Oil leakage due to improper machining of the oil return thread or excessive coaxiality deviation between the threaded journal and the oil seal seat hole.

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LaGianna

08/10/25 5:07pm

As someone who frequently works on vehicles, I've found several most common causes of car oil leaks. The oil pan gasket aging is the most prevalent; over time, rubber hardens and cracks, allowing oil to slowly seep through the gaps. Additionally, if the oil filter gasket isn't properly installed or becomes worn, it can also leak—especially when DIYers change filters and might overlook this. Another common issue is a loose drain plug; some owners don't tighten it sufficiently after maintenance or the washer gets damaged, leading to leaks. In many cases I've seen, a failed valve cover gasket also causes oil leaks due to engine heat hardening the rubber over time. When inspecting, lift the car to check for oil traces on the undercarriage and monitor if the oil level drops rapidly. Ignoring leaks can lead to engine wear or even fire hazards, so I recommend early detection and repair. Developing a habit of checking for oil drips under your parked car is wise for daily drivers.

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