Why Does the Engine Leak Oil?

2 Answers
LaylaLee
07/29/25 2:23am
Automobile engine oil leakage is categorized into engine oil leakage and engine oil seepage. Below is a detailed introduction to the causes of automobile engine oil leakage: 1. Automobile engine oil leakage: The engine casing surface exhibits clearly visible oil stains. If these stains are cleaned off but reappear shortly afterward, or in severe cases, oil drips down like water droplets, the vehicle should be sent for repair as soon as possible. 2. Automobile engine oil seepage: The engine casing shows only minor oil stains. This indicates that the engine oil leakage is not particularly severe, with the seepage being minimal and barely noticeable. The most direct and effective solution is to replace all the sealing rings.
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StHarrison
08/12/25 6:21am
There are many reasons for engine oil leaks. From my experience, the most common cause is aging seals like the crankshaft rear oil seal or oil pan gasket. Rubber materials harden and crack over time, leading to oil seepage. I've also seen cases where bolts weren't tightened properly - especially with frequent chassis vibrations, loose screws over time can cause oil dripping. Additionally, excessive oil pressure can be problematic; if the oil filter is clogged or the pump malfunctions, high pressure forces oil through small gaps. Component wear such as damaged piston rings allows oil to enter the combustion chamber, increasing leak risks. Neglecting maintenance is a major issue - many owners overlook regular gasket replacement until leaks appear. I've also noticed post-accident damage often causes leaks, like oil seal damage after chassis collisions. In short, never ignore oil stains on the ground - inspect immediately to prevent engine damage or fire hazards.
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