A car can leak oil for several common reasons, including:
- Worn or damaged gaskets such as valve cover gasket, oil pan gasket, and timing cover gasket. These gaskets seal engine parts and deteriorate over time due to heat and pressure, causing oil to escape.
- Loose or improperly tightened drain plug or oil filter. The drain plug is removed during oil changes and if not securely tightened or its seal/washers are worn, oil can leak out.
- Worn seals like crankshaft or camshaft seals that keep oil contained inside the engine. When these seals dry out or get damaged, oil leaks can develop.
- Damaged oil pan or oil filter can also cause leaks if cracked or punctured by impact or corrosion.
- Faulty or loose oil filler cap can allow oil to seep or spray out, especially if the engine is overfilled or pressure builds inside the engine crankcase.
- High pressure inside the engine crankcase, often from a faulty PCV valve, can force oil out through seals and gaskets.
Oil leaks are noticeable typically when the car is parked as gravity causes oil to seep through damaged seals and gaskets. Regular vehicle maintenance and oil changes are crucial to prevent leaks and avoid engine damage. Checking the oil level, inspecting gaskets, seals, drain plugs, oil filter, and the oil filler cap can help diagnose the exact source of the leak.
If experiencing an oil leak, it is recommended to have a professional mechanic examine the vehicle for accurate diagnosis and repair to prevent engine damage.
