Parts for your 2017 Mitsubishi Eclipse cross-Sump plug washers

2017 Mitsubishi Eclipse Cross sump plug washers — what they do and when to swap them

Based on Mitsubishi Motors workshop information for the Eclipse Cross (GK/GL series, 2017–) and the MMC ASA genuine parts catalogue, the engine oil drain plug on this model is designed to be fitted with a dedicated crush-type sump plug washer (also called a drain plug gasket). The service manual’s engine oil change procedure specifies refitting the drain plug with a new gasket, confirming that a sump plug washer is relevant and used on the 2017 Mitsubishi Eclipse Cross.

For the 2017 Eclipse Cross, the sump plug washer is a small single-use seal that sits under the drain plug in the alloy or steel sump. When the plug is torqued, the soft metal washer (usually aluminium or copper) deforms slightly to take up any tiny imperfections between the plug and the sump face. That controlled “crush” is what keeps hot engine oil from weeping out after the bonnet’s shut and the kilometres start rolling on.

Because it’s a crush washer, it’s designed to be replaced whenever the oil is changed. Re‑using a flattened or nicked washer is a classic cause of slow leaks, drips on the driveway, and a messy undertray. Mitsubishi’s service literature for GK/GL Eclipse Cross engines (including the 1.5‑litre turbo petrol and market‑specific diesel) calls for a new drain plug gasket at each service. It’s a cheap part that protects much pricier ones.

• Replace the sump plug washer at every oil service interval (follow your local schedule — often 10,000–15,000 km or 12 months for ANZ conditions).
• Use an OE or OE‑equivalent crush washer matched to the plug size for your exact engine code, confirm by VIN or parts catalogue if unsure.
• Wipe the sump’s sealing face clean, thread the plug in by hand first, then tighten to the factory torque listed in the workshop manual — no need for sealant or tape.
• After the first heat cycle, have a quick look for any tell‑tale oil misting around the plug.

If caught short, a previously used washer may get you home, but it’s best treated as a temporary fix. Keeping a couple of correct washers in the glovebox is a tidy little insurance policy. When fitted and tightened correctly, the sump plug washer helps maintain proper oil containment, stable oil pressure, and a cleaner underbody — exactly what’s wanted for reliable motoring across Aussie and Kiwi roads.

Popular questions

What size sump plug washer does a 2017 Eclipse Cross use?
The size depends on the exact engine and market spec. Many Eclipse Cross variants use a crush washer matched to the factory drain plug (commonly an M14 type), but the safest bet is to confirm via the VIN in the Mitsubishi parts catalogue or check the existing plug and washer before purchase.

Do you really need to replace the washer at every oil change?
Yes — Mitsubishi’s workshop procedure specifies a new drain plug gasket whenever the engine oil is changed. Re‑using a crushed washer risks seepage, drips, and inconsistent clamp load on the plug.

What torque should the drain plug be tightened to?
Use the torque figure in the Mitsubishi workshop manual for your engine code. The correct torque avoids both under‑clamping (leaks) and over‑tightening (damaged threads or a distorted washer). If you don’t have the spec to hand, a technician or dealer can provide it from the VIN.