What Causes Engine Oil Leakage in a Car?

[DiDaniel]

Reasons for engine oil leakage in a car: 1. Drain plug leakage, where oil seeps externally, lubricant leaks at the engine sump drain bolt, or the sealing performance of the engine sump gasket fails, causing lubricant leakage; 2. Incorrect oil level or inaccurate dipstick reading; 3. Blockage or component failure in the crankcase ventilation system, such as turbocharger failure. Solutions for engine oil leakage: 1. Replace aging gaskets, including the oil pan gasket, valve cover gasket, front and rear crankshaft oil seals, camshaft oil seals, etc.; 2. When adding oil at the oil filler port, be careful and steady each time to avoid overflow and dripping; 3. When tightening the drain bolt after an oil change, avoid excessive force, especially with aluminum oil pans, as this can lead to poor sealing and oil leakage after a few instances; 4. If the oil filter housing seal is not tight and leaks oil, replace the sealing gasket.

[VonKing]

When dealing with car issues, I often encounter oil leaks. The most common cause is aging and cracking of engine seals, such as the oil pan gasket becoming hard and damaged. Over time, the material degrades and starts to seep oil. If the oil filter is not installed properly or sealed well, or if the screws were not tightened properly during the last oil change, it can also lead to oil dripping. Leak points are usually located underneath the car, and you can spot oil stains on the ground after parking. If not repaired promptly, the oil level can drop quickly, causing the engine to lack lubrication, leading to overheating, bearing damage, or even a seized crankshaft requiring major repairs. Therefore, I recommend replacing seals during regular maintenance to prevent issues. If you notice an oil leak, don't delay—visit a professional shop early to identify and fix the source, preventing minor issues from becoming major problems.

[McNicole]

A while ago, I was really worried when my car started leaking engine oil. While driving, I smelled a strong oil odor and got out to find a pool of oil under the car, which scared me. Checking the dipstick, I saw the oil was almost empty, so I quickly topped it up and went to a mechanic. It turned out the oil filter was loose, and the sealing ring had failed, causing a serious leak. He said this is a common issue with aging seals, especially in older cars where the rubber cracks and loses its seal. Since then, I’ve made it a habit to check the car’s undercarriage and oil level every month. Oil leaks not only waste oil but can also pollute the environment, and what’s worse, insufficient engine lubrication can damage parts and increase repair costs. Dealing with it early is much more cost-effective.

[OIker]

Oil leakage is mostly caused by poor sealing, such as a loosely installed filter, loose screws, or an aged oil pan gasket. When the engine is hot, the thinner oil is more prone to seep out. The inspection method is simple: park the car when it's cold and check for oil stains underneath. If the oil level on the dipstick is low, it confirms a leak. Severe oil shortage leads to lubrication failure, causing excessive friction between engine components and rapid engine failure. If you don't know how to repair it, take it directly to a repair shop without delay to prevent further issues.