Why Does Oil Leak After an Oil Change?
2 Answers
Because the oil pan bolt is not tightened properly or the drain plug gasket needs replacement (poor sealing). As the engine operates, engine oil has strong permeability and typically seeps slightly from the oil seal, which is a common occurrence and not a malfunction. Below are explanations of two scenarios: Minor Oil Seepage: It does not significantly affect the engine. It is advisable to continue using the vehicle while monitoring the situation. For oil seepage or slow leaks, identify the location, usually most common at joints. Sometimes, simply tightening the relevant screws yourself can resolve the issue. Long-term Oil Seepage: It is recommended to have it inspected at a professional repair shop. Although this seepage does not affect the engine's overall operation, it depletes the lubrication system's oil over time, reducing the oil level. Prolonged seepage can degrade the lubrication system's effectiveness and ultimately shorten the engine's lifespan.
I've also encountered oil leaks after an oil change on my own car a few times, mainly due to minor oversights during maintenance. The most common issue is an improperly tightened oil filter – if the worker doesn't apply enough force or the threads aren't aligned properly when installing a new filter, it can easily become loose and leak. The oil drain plug might also not be secured well, or the washer could be aged and not replaced, compromising the seal. Once I went to a non-professional shop where they overtightened the screw and damaged the sealing ring instead, causing slow oil seepage. Another cause is overfilling the oil – exceeding the maximum fill level increases engine pressure and forces oil to seep out from weak points. My suggestion is to check under your car for any oil stains after the next oil change, choose a reliable repair shop instead of going for cheap options, and regularly monitor your oil condition during routine maintenance.