Parts for your 2021 Mitsubishi Eclipse cross-Sump plug washers

2021 Mitsubishi Eclipse Cross sump plug washers

Yes, the 2021 Mitsubishi Eclipse Cross uses a sump plug washer. Mitsubishi’s workshop manual for the Eclipse Cross (GK/GL series) specifies a replaceable drain plug gasket during engine oil changes, and the Mitsubishi ASA electronic parts catalogue lists an oil pan drain plug gasket for the Eclipse Cross 4B40/4B12 engines. In most applications it’s a 14 mm aluminium crush washer (commonly supplied under Mitsubishi part numbers used broadly across late-model Mitsubishis). That technical combo confirms a sump plug washer is absolutely relevant on this vehicle.

What’s it do? The sump plug washer is a soft, sacrificial seal that deforms to fill any microscopic gaps between the drain plug and the alloy sump. That crush action delivers a leak-free seal at the correct torque, helps protect the sump threads, and keeps engine oil where it belongs. It’s a small, inexpensive part that does a big job in long-term engine protection—especially important for turbocharged engines like the 1.5‑litre in many AU/NZ Eclipse Cross models.

For servicing, it’s best practice to replace the sump plug washer at every oil change. Once it’s been crushed, reusing it risks weeping or drips that can leave spots on the driveway and, over time, lower the oil level. Fit a new OEM-quality aluminium (or approved copper) washer of the correct size, clean the mating surfaces, and tighten the drain plug to the factory torque using a torque wrench. Avoid thread tape or sealants, the washer provides the seal. After the first short drive, a quick check for any trace of seepage is a smart move.

Signs it needs attention include a faint oil halo around the plug, a drip forming at the lowest edge of the sump, or a washer that looks flattened, nicked, or gouged. Keeping a couple of spare washers on hand makes DIY services simpler, and they’re cheap insurance alongside fresh oil and a new filter. Whether the job’s done on the driveway or by a trusted mechanic, swapping the washer each service aligns with Mitsubishi’s workshop guidance and keeps the Eclipse Cross tidy and reliable.

• Replace the washer every oil change (typically 12 months/15,000 km in AU/NZ service schedules).
• Use the correct-size aluminium crush washer and proper torque.
• Dispose of old oil responsibly, keep a few spare washers in the glovebox or toolbox.

FAQs

Does the 2021 Mitsubishi Eclipse Cross have a sump plug washer?
Yes. Mitsubishi’s workshop manual instructs replacing the drain plug gasket during oil changes, and the Mitsubishi parts catalogue lists a dedicated oil pan drain plug gasket for Eclipse Cross engines. That means a crush-style sump plug washer is fitted and should be renewed when the plug is removed.

What size sump plug washer does it use?
It typically uses a 14 mm aluminium crush washer as specified across many late-model Mitsubishis. Part numbering can vary by market and supersession, so the safest bet is to match by VIN or use a quality aftermarket equivalent that states compatibility with the 2021 Eclipse Cross.

How often should it be replaced—and can it be reused?
Replace it at every oil change. Once crushed, the washer doesn’t spring back and may not seal properly if reused. For a leak-free result, fit a new washer and tighten the plug to the factory torque listed in the workshop manual.