What are the causes of oil leakage in MG engines?
3 Answers
The causes of oil leakage in MG engines include component failure, crankshaft failure, timing gear failure, etc. Specific reasons are as follows: Component failure: Oil leakage may occur due to deformation or poor sealing of parts such as the valve cover gasket, oil cooler, oil filter, rocker arm cover, camshaft rear seal cover, and engine mounting plate. Crankshaft failure: When the front and rear crankshaft oil seals and oil pan gasket are damaged to varying degrees, it can also lead to engine oil leakage. Timing gear failure: If the timing gear cover gasket is improperly installed during assembly or gets damaged, it may cause screw loosening and result in oil leakage.
From my years of experience driving old MG cars, the most common cause of engine oil leaks is the aging of the oil pan gasket. Over time, the rubber hardens and cracks, leading to leaks. Another major cause is damage to the valve cover gasket, where frequent use in high-temperature environments makes the material brittle and prone to leaks. Issues like loose or improperly tightened bolts can also cause oil to slowly seep out, especially if post-maintenance checks are insufficient. External factors, such as hitting rocks while driving, which can damage the oil pan, or prolonged vehicle storage leading to corrosion and rust, may also result in leaks. Failing to address oil leaks promptly can lead to poor engine lubrication, overheating, and even engine failure, as well as increased oil consumption. I recommend regularly opening the hood to inspect the condition of seals and gaskets. If you spot any oil stains, take the car to a professional repair shop immediately—don’t delay. Using high-quality replacement parts can help avoid recurring issues.
I usually drive this MG for commuting, and recently noticed oil stains on the ground while washing the car. Upon inspection, it turned out to be an engine oil leak. After consulting with a mechanic and friends, the common causes include improper installation of the oil filter leading to poor sealing, or worn piston rings allowing oil to leak through gaps. The valve cover gasket is also prone to aging and cracking under high temperatures. Additionally, damaged engine seals or minor external impacts damaging the oil lines can cause leaks. Small oil leaks can escalate into bigger issues, such as engine knocking or increased fuel consumption. I adopt a gentle driving style to minimize vibration and wear, and regular maintenance to check oil pressure can help prevent leaks. If you notice a problem, don’t try to fix it yourself—seek a professional mechanic for quick diagnosis and repair. Regularly cleaning engine bay dust can also reduce seal damage.
