Parts for your 2020 Mitsubishi Asx-Sump plug washers

2020 Mitsubishi ASX sump plug washers — yes, they’re fitted and they matter

For the 2020 Mitsubishi ASX, a sump plug washer is absolutely used and relevant. Technical sources such as the Mitsubishi Motors Service Manual for ASX (GA/GM series, Engine Lubrication section) and the Mitsubishi ASA Electronic Parts Catalogue list a separate engine oil drain plug gasket (aluminium crush washer) for this model year. In many ASX/Outlander Sport/RVR applications, the washer is the common 14 mm aluminium type (often referenced in parts catalogues under codes like MD050317), supplied as a discrete service item.

What does it do? The sump plug washer provides a reliable, single-use seal between the drain bolt and the sump. When tightened, the soft aluminium crushes slightly to fill any tiny imperfections in the mating faces, stopping oil weeps and protecting the sump’s threads by allowing proper torque without overloading the alloy. It’s a small part doing a big job every time the engine oil is changed.

As part of routine servicing on a 2020 Mitsubishi ASX, replacing the sump plug washer at each oil change is best practice. The workshop literature instructs fitment of a new gasket whenever the plug is removed, because the crush feature is designed for one use. Reusing a flattened washer can lead to seepage, spotting on the driveway, or the temptation to over-tighten the plug. Signs a washer is past it include a visibly flattened or grooved face, hardening, or any halo of oil around the plug after a drive.

A few handy service tips: clean the plug and sump seat so the new washer has perfect contact, avoid sealants (they’re not needed and can contaminate the system), and tighten the drain plug to the specified torque from the Mitsubishi manual—no more, no less. Keeping a small pack of genuine or high-quality aftermarket 14 mm aluminium washers on the shelf makes oil changes quicker and tidier.

• Washer style: single-use, crush-type (aluminium is OE-preferred, copper equivalents also seal well).
• When to replace: every oil change or any time the plug is removed.
• Fitment notes: ensure correct inner diameter (typically 14 mm) and seat faces are clean, torque to the spec in the factory manual.

These details align with Mitsubishi’s service documentation and the ASA EPC listings for the 2020 ASX, where the drain plug gasket appears as a replaceable component alongside the plug itself.

Popular questions

Does the 2020 Mitsubishi ASX have a sump plug washer?
Yes. The 2020 ASX uses a crush-type sump plug washer. Mitsubishi’s service literature and parts catalogues specify replacing the gasket whenever the drain plug is removed during an oil change.

What size sump plug washer does a 2020 ASX take?
Most 2020 ASX models use a 14 mm inner-diameter aluminium crush washer commonly supplied across Mitsubishi models. For absolute certainty, match by VIN or take the old washer to compare ID/OD before purchase.

Can the sump plug washer be reused?
It’s not recommended. A crush washer is engineered to deform once for a perfect seal. Reusing can cause weeping and may tempt over-tightening. If it’s been reused in a pinch, replace it at the next opportunity and check for any signs of seepage.