Parts for your 2015 Mitsubishi Outlander-Sump plug washers

2015 Mitsubishi Outlander — Sump Plug Washers

Yes, the 2015 Mitsubishi Outlander uses a sump plug washer. Technical references back this up: the Mitsubishi Outlander Workshop Manual (2013–2015, Group 11A – Lubrication) instructs refitting the engine oil drain plug with a new gasket and tightening it to 39 N·m. Mitsubishi’s ASA electronic parts catalogue lists a replaceable crush washer for the drain plug across the 4B11, 4B12, 4N14 and 6B31 engines fitted to this model range, with a common OE M14 copper/aluminium gasket (often catalogued as MD050317). Independent data publishers such as Autodata and Haynes also note the washer is a replace-at-each-service item.

On this Outlander, the sump plug washer is a small, single-use crush ring that sits under the drain plug head. Its job is simple but critical: it deforms as the plug is torqued, sealing the sump so fresh oil stays put under heat and vibration. If the washer is reused, it may not crush evenly again, which can lead to weeping around the plug, drips on the driveway, and—over time—low oil level.

For routine servicing, Outlander owners are best to treat the washer as a consumable. Replace it at every oil change, whether the engine is the 2.0L, 2.4L petrol, the V6, or the 2.2L diesel. A new OE or quality aftermarket M14 crush washer is inexpensive and helps protect the alloy sump threads by achieving a proper seal at the correct torque rather than relying on extra grunt.

Torque matters here. The workshop spec calls for about 39 N·m on a clean, lightly oiled plug thread with a new washer. Over-tightening can deform the washer too far and risk damaging threads, under-tightening can allow a slow leak. A torque wrench and a couple of spare washers in the glovebox make life easier.

Signs a washer needs attention include oil dampness around the plug, fresh oil spots under the car after a change, or a plug that needed “just a bit more” to stop seeping. When in doubt, fit a new washer. Aluminium and copper versions both work, copper crushes a touch more progressively, while aluminium is common on OE kits. Always match the inner diameter (M14 for most Outlanders of this year) and avoid hard, flat “reusable” washers unless specifically specified for the vehicle.

• Replace the washer at every oil and filter service (10,000–15,000 km, or as per schedule).
• Clean the mating face on the sump before refitting.
• Torque to spec—don’t “nip it up” by feel.

What size sump plug washer does a 2015 Outlander use?

Most 2015 Outlanders use an M14 crush washer, commonly referenced under Mitsubishi’s OE gasket listing (often seen as MD050317). Variations can exist by engine code, so it’s smart to confirm against the VIN or the old washer’s size before purchase.

How often should the sump plug washer be replaced?

Every oil change. The washer is designed to crush once and seal reliably. Reusing it risks seepage and overtightening, which can be costly if sump threads are damaged.

What’s the correct torque for the drain plug on a 2015 Outlander?

Approximately 39 N·m is specified in the Mitsubishi workshop manual for this model year. That value suits a clean thread and a brand-new crush washer. Engine variants may list the same spec, but always confirm against the service data for the exact engine code.