Parts for your 2017 Mitsubishi Lancer-Sump plug washers

2017 Mitsubishi Lancer sump-plug-washers: what they do and when to replace them

Based on Mitsubishi Motors technical documentation for the CJ/CF Lancer (Engine 4B11/4B12, Lubrication) and the Mitsubishi ASA parts catalogue, the 2017 Mitsubishi Lancer uses a sump plug washer on the engine oil drain plug. The washer is specified as a 14 mm aluminium crush-type gasket (commonly listed as MD050317, M14 x 1.5 plug interface). That means sump-plug-washers are absolutely relevant to this vehicle’s servicing.

A sump-plug-washer (also called a crush washer or drain plug gasket) seals the gap between the steel drain bolt and the alloy sump. When the plug is tightened to the correct torque, the soft aluminium washer deforms slightly, creating a gas- and oil-tight seal that prevents weeping after an oil change. Because it crushes to form that seal, it’s designed as a single-use item.

For the 2017 Lancer, replacing the sump-plug-washer at every oil change is the smart move. It’s inexpensive insurance against drips on the driveway, underbody mess, and gradual oil loss. The service manual torque for the engine oil drain plug is around 29–32 N·m, so there’s no need to swing off the spanner—over-tightening risks stripping the alloy threads in the sump and can distort even a new washer.

Good practice for Lancer owners and workshops in Aus/NZ:

• Fit a new 14 mm aluminium crush washer at each oil and filter change (typically every 10,000–15,000 km or 12 months, depending on conditions).
• Clean the sump face and plug head so the washer seats flat, no sealants or thread tape are needed.
• Hand-start the plug to avoid cross-threading, then torque to spec. If a torque wrench isn’t handy, aim for snug plus a small nip, not “gorilla tight”.
• After the first warm run, check for any misting around the plug, if present, recheck torque or replace the washer.

The common washer size for this model is 14 mm internal diameter, typically about 22 mm outer diameter. Aluminium is OE-correct, though quality copper crush washers also work, avoid reusing old washers and skip fibre or bonded types unless specified by the parts listing. Sticking with the proper washer type—MD050317 or an equivalent 14 mm aluminium crush gasket—keeps the 2017 Lancer sealed properly and makes every service that little bit tidier.

Popular questions about 2017 Mitsubishi Lancer sump-plug-washers

What size sump-plug-washer does a 2017 Mitsubishi Lancer use?
Most 2017 Lancers with the 4B11 or 4B12 engine use a 14 mm aluminium crush washer on the engine oil drain plug. It’s commonly referenced against Mitsubishi part MD050317. A quality 14 mm alloy crush washer from a reputable brand will do the job perfectly.

How often should the sump-plug-washer be replaced?
Best practice is to replace it at every oil change. Because it’s a crush-style gasket, reuse can lead to weeping or slow leaks. Given the low cost, swapping it each service saves hassle later—especially on longer intervals common in Australia and New Zealand.

What torque should the drain plug be tightened to?
The factory spec sits around 29–32 N·m for the Lancer’s engine oil drain plug. Use a torque wrench where possible. Avoid overtightening, as the sump is aluminium and the goal is a clean seal through the new washer rather than brute force.