Parts for your 2020 Mitsubishi Outlander-Sump plug washers

2020 Mitsubishi Outlander sump plug washers

Technical sources confirm the 2020 Mitsubishi Outlander is fitted with a sump plug washer. The Mitsubishi Motors Outlander ZL/ZE Workshop/Service Manual (2016–2021, Engine Lubrication section) specifies replacing the drain plug gasket at each engine oil change, and the Mitsubishi Genuine Parts catalogue (ASA) lists an engine oil drain plug gasket for the Outlander’s 4B11/4B12 petrol and PHEV engines (commonly supplied as a 14 mm aluminium crush washer, e.g., MD050317). The manual also notes tightening the drain plug to factory torque (around 39 N·m, model-dependent) and checking for leaks—procedures that assume a new crush washer is installed.

For the 2020 Mitsubishi Outlander, the sump plug washer is a small, single-use crush gasket that seals the engine oil drain plug to the sump. Its job is simple but critical: as the plug is tightened, the soft aluminium washer deforms to fill tiny imperfections between the plug flange and sump face, preventing weeps and drips. Skip it or reuse a flattened one and they’ll often end up with a damp sump, spots on the driveway, or—worst case—an under‑torqued plug that could loosen over time.

Best practice for servicing a 2020 Outlander is to replace the sump plug washer at every oil change. It’s a low-cost bit that saves headaches later. When the oil’s drained, make sure the old washer isn’t stuck to the sump, clean the mating face, fit a new 14 mm aluminium crush washer, and tighten the plug to the factory spec (around 39 N·m for most 4B1 engines—always check the exact value in the vehicle’s service data). After refilling, run the engine, then check under the bonnet and underneath for any signs of seepage.

Good quality options include the genuine Mitsubishi part or an OEM‑equivalent aluminium crush washer with the correct dimensions. Copper crush washers can work too, but the feel on torque and crush is slightly different—stick with aluminium if they want to match factory behaviour. Avoid fibre or rubber‑bonded “reusable” styles unless the service information for that exact engine approves them.

• Replace at every oil change (time/kilometres per the logbook).
• If there’s any weeping around the plug, fit a new washer and re‑torque.
• Never double‑stack washers and don’t overtighten to “chase” a seal.

Look after this tiny part and the Outlander’s sump stays clean, the oil stays where it should, and servicing remains hassle‑free. It’s a small swap that pays off big.

FAQs

What size sump plug washer does a 2020 Mitsubishi Outlander use?
Most 2020 Outlander petrol and PHEV variants use a 14 mm aluminium crush washer (genuine examples are often catalogued under MD050317). Aftermarket 14 mm aluminium washers that match the factory thickness and outside diameter are fine if they meet OEM spec.

How often should the sump plug washer be replaced on a 2020 Outlander?
Every oil change. The workshop manual calls for renewing the drain plug gasket whenever the plug is removed. For many Aussie and Kiwi schedules that’s typically every 10,000–15,000 km or 12 months, whichever comes first.

What is the torque for the Outlander’s sump plug?
Expect roughly 39 N·m for the 4B11/4B12-based engines, but they should always confirm against the specific service data for their VIN. Using a torque wrench with a fresh crush washer is the key to a reliable, leak‑free seal.