Parts for your 2013 Mitsubishi Outlander-Sump plug washers

2013 Mitsubishi Outlander sump plug washers — what they do and when to replace them

Based on Mitsubishi’s factory literature and parts data, the 2013 Mitsubishi Outlander does use a sump plug washer. The Outlander service manual for the ZJ/ZK series (Engine Lubrication section) instructs fitting a new drain plug gasket at each engine oil change, and the Mitsubishi ASA electronic parts catalogue lists an M14 crush-type drain plug gasket for the 4B11/4B12 four‑cylinders and the 6B31 V6 (commonly supplied as a genuine aluminium gasket, e.g., MD050317 or its supersession, always confirm by VIN). These technical sources make it clear the washer is a standard, service-replaceable sealing part on this model.

For the 2013 Outlander, the sump plug washer’s job is straightforward but crucial: it crushes slightly as the drain plug is tightened, creating a reliable seal between the plug head and the sump so engine oil can’t weep out. Because it’s a crush washer, it’s designed for one-time use — once compressed, it won’t spring back to form the same tight seal again. Reusing a flattened washer is one of the most common causes of slow drips after an oil change.

When servicing an Outlander, it’s smart to have a couple of spare sump plug washers on hand. After draining the oil, wipe the sump’s sealing face clean, check the plug threads for damage, and fit a fresh, correct-size M14 washer (OEM or a quality equivalent). Tighten the plug with a torque wrench to the factory spec for the specific engine variant — the service manual is the go-to for that figure. Avoid overtightening, it can distort the washer excessively or, worse, damage the sump threads.

Some aftermarket options are aluminium, others are copper. Both can work if sized correctly, but the genuine-style aluminium crush washer is what Mitsubishi specifies. Don’t stack washers to “make up” thickness, and don’t try to “save” a buck by reusing an old one — it often ends up costing more in leaked oil and a redo.

• Replace the sump plug washer at every engine oil change or any time the plug is removed.
• Use the correct M14 crush washer (check your VIN in the EPC if unsure).
• Clean the mating surfaces and torque the plug to the spec listed in the Outlander service manual.
• If there’s any sign of seepage after a service, inspect the plug and washer first.

A simple new washer every service keeps the Outlander’s sump bone-dry and the driveway spotless — exactly how it should be.

What size sump plug washer does a 2013 Outlander use?

It uses an M14 crush washer for the engine oil drain plug on the 2013 Outlander range. Genuine Mitsubishi parts catalogues commonly list an aluminium washer supplied under MD050317 (or a superseding number). Always confirm against the vehicle’s VIN, especially if the sump, plug, or engine has been changed.

Should the sump plug washer be replaced at every oil change?

Yes. The washer is a crush-type seal intended for single use. Replacing it at each oil change helps prevent annoying weeps and ensures the correct clamping load at the specified torque. It’s a low-cost part that protects the sump threads and keeps the seal reliable.

Can a copper washer be used instead of aluminium?

It can, provided it’s the correct M14 size and is a proper crush or sealing washer. That said, Mitsubishi specifies an aluminium crush washer, and sticking with the OEM style is the safest bet. If using copper, ensure a quality part and never stack washers to compensate for thickness.