Parts for your 2015 Mitsubishi Asx-Sump plug washers

2015 Mitsubishi ASX sump plug washers — what they do and when to replace

Yes, the 2015 Mitsubishi ASX is fitted with a sump plug washer. Mitsubishi’s own workshop literature for the 4B1-series engines (as used in the ASX) specifies replacing the drain plug gasket whenever the sump plug is removed, and dealer electronic parts catalogues used in Australia and New Zealand list a separate aluminium crush washer for the ASX/Outlander Sport of this era. Those technical sources make it clear the washer isn’t optional — it’s a service item designed to be renewed at each oil change.

A sump plug washer (often called a crush washer) sits between the sump plug head and the oil pan. As the plug is tightened to the specified torque, the soft metal washer deforms slightly, filling tiny imperfections and creating a reliable oil-tight seal. That little ring prevents weeping and drips, protects the sump face from galling, and helps the plug reach proper clamping force without over-tightening. On the 2015 Mitsubishi ASX, using the right washer material and a fresh one each service keeps the bottom end clean and the driveway free of spots.

Because sump-plug-washers are designed to crush, they’re effectively single-use. Reusing a flattened washer can lead to slow leaks, or worse, extra force on the plug that can damage threads. As part of routine servicing on a 2015-mitsubishi-asx, replace the washer at every engine oil change and torque the plug to the workshop spec — no guessing and no breaker bars. If the sump face or plug shows nicks, clean them carefully before fitting the new washer, if damage is pronounced, fit a new plug and reassess the pan sealing surface.

Handy tips for ASX owners and techs in AU/NZ include keeping a couple of spare aluminium washers on hand, never stacking washers to “make do”, and wiping the area dry after refilling to confirm there’s no seepage. If a drip appears after a drive, don’t crank the plug tighter, instead, refit with a new washer and correct torque. Copper washers exist, but Mitsubishi commonly specifies aluminium, match what the parts catalogue lists for the VIN. It’s a small, low-cost part that does a big job, and replacing it as part of every service helps the ASX stay leak-free and easy to live with.

• Replace the washer at every oil change
• Use the correct washer type listed for the ASX
• Tighten the sump plug to the manual’s torque spec

Popular questions

Does the 2015 Mitsubishi ASX use a sump plug washer?
Yes. Mitsubishi workshop documentation for the ASX’s 4B1-series engines calls for a new drain plug gasket whenever the plug is removed, and dealer parts catalogues in AU/NZ list an aluminium crush washer for the sump plug. It’s a standard service item.

How often should the sump plug washer be replaced on a 2015 ASX?
Replace it at every engine oil change. The washer is designed to crush once to form a seal, reusing it risks weeping or leaks. Always fit a new washer and tighten the plug to the specified torque.

What type of washer should be used?
Use the washer type specified for the vehicle’s VIN in the Mitsubishi parts catalogue, typically an aluminium crush washer for the ASX. Avoid stacking washers or substituting random sizes or materials, as that can compromise sealing and torque accuracy.