Parts for your 2022 Mitsubishi Eclipse cross-Sump plug washers

2022 Mitsubishi Eclipse Cross sump plug washer — what it does and when to swap it

Yes, the 2022 Mitsubishi Eclipse Cross does use a sump plug washer. Mitsubishi’s factory workshop manual for the GK-series Eclipse Cross (Engine Lubrication section) specifies fitting a new drain plug gasket whenever the engine oil is changed and tightening the plug to the specified torque. The Mitsubishi ASA electronic parts catalogue also lists a dedicated oil drain plug gasket for Eclipse Cross models of this era (commonly referenced as MD050317, 14 mm). Those technical sources make it clear the washer is a standard, expected service item on this vehicle.

On the Eclipse Cross, the sump plug washer is a soft aluminium or copper “crush” gasket that sits between the drain plug head and the alloy sump. When the plug is torqued, the washer deforms slightly to create a perfect seal. That prevents weeps around the plug, protects the alloy sump face, and helps keep the driveway and the environment free of oil drips.

Because it’s a crush-style gasket, it’s designed for single use. Re‑using it can lead to annoying seeps that show up a few days after a service. Best practice for the 2022 Eclipse Cross is to replace the washer at every oil change, the same way Mitsubishi’s service literature describes. A genuine or quality aftermarket 14 mm ID washer (MD050317 or equivalent) is the go.

When servicing:

• Always fit a new washer and start the drain plug by hand to avoid cross‑threading the alloy sump.
• Tighten to the workshop spec (commonly quoted by Mitsubishi as around 39 N·m for similar 4-cylinder applications). Don’t “swing off it” with a long bar.
• Never stack washers, and don’t use sealants or thread tape — the crush washer does the sealing.
• After the first heat cycle, have a quick look underneath for any signs of misting, if needed, recheck torque.

If the sump face has been marked by a reused washer, lightly clean it with a lint‑free cloth — no abrasives. A fresh, correctly sized washer, the right torque, and clean mating surfaces will keep the Eclipse Cross bone‑dry between services.

• What size sump plug washer does a 2022 Eclipse Cross use?
  It uses a 14 mm inner diameter crush washer. Mitsubishi commonly lists MD050317 for this role on GK‑series Eclipse Cross models. If you’re unsure, match by VIN or take the old washer to compare thickness and outer diameter.
• How often should the sump plug washer be replaced?
  Every oil change. It’s a single‑use crush washer, once compressed, it won’t reliably reseal. Fit a new one and torque the plug to spec to avoid leaks.
• Can the washer be reused if it looks OK?
  Wouldn’t recommend it. Reusing often leads to slow weeps that appear after a few heat cycles. A new washer is cheap insurance against leaks and stripped threads from overtightening.