Th5 . 12, 2025 18:00 Trở lại danh sách

Solving Common Issues with a Leaking Drain Plug

A properly functioning drain plug is essential to every successful oil change. However, when the drain plug is leaking or loose, it can lead to oil loss and engine damage. This article will help you understand the causes of a drain plug leaking oil, how to fix it, and what to look out for during your next drain plug oil change.

Why Is My Drain Plug Leaking Oil?

A drain plug leaking oil is often the result of a worn washer, damaged threads, or improper installation. Over time, the sealing washer on the drain plug can flatten or crack, preventing a tight seal. A cross-threaded or over-tightened plug can also damage the drain plug nut or oil pan threads, making it impossible to seal properly.

If you notice oil spots under your car after an oil change, inspect the drain plug area immediately. Oil leaks left unaddressed can lead to engine wear or even failure due to low oil levels.

Fixing a Loose Drain Plug and Preventing Future Leaks

A drain plug loose after an oil change is a common but avoidable issue. If the plug wasn’t torqued correctly or the washer wasn’t replaced, it could slowly back out or allow oil to seep through.

To fix a loose or leaking plug:

Safely lift the car and locate the drain plug.

Check if it is visibly loose and gently tighten it using a torque wrench to your vehicle's specifications.

If it continues to leak, replace the washer or the entire drain plug.

In cases of thread damage, you may need a thread repair kit or oversized plug.

Avoid over-tightening, as this can strip the drain plug nut threads and worsen the problem.

Best Practices During a Drain Plug Oil Change

During every drain plug oil change, inspect the plug and washer. Replace any part that looks damaged or worn. It’s also a good habit to clean the plug and oil pan surface before reinstalling the plug to ensure a good seal.

Use the correct torque setting to avoid both over- and under-tightening. If your vehicle uses a magnetic drain plug, check it for metal debris that could indicate engine wear.

A small drain plug leaking oil can lead to big problems if ignored. Regular inspection, proper installation, and replacing worn components during every drain plug oil change will help keep your engine clean, lubricated, and leak-free.

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