Parts for your 2006 Mitsubishi Outlander-Sump plug washers

2006 Mitsubishi Outlander sump plug washers

Based on technical sources, a sump plug washer is indeed fitted to the 2006 Mitsubishi Outlander. The Mitsubishi Motors Service Manual (2003–2006 Outlander, Group 11A—Engine: Lubrication) specifies a sealing washer (crush washer/gasket) for the engine oil drain plug and instructs replacement at each removal. The Mitsubishi ASA/EPC parts catalogue lists the oil drain plug gasket for the 4G6-series engines used in this model year as a 14 mm crush washer (commonly referenced as MD050317). Typical factory torque guidance for the drain plug is around 39 N·m (29 ft·lb) in these manuals.

On this Outlander, the sump plug washer’s job is simple but critical: it crushes slightly as the drain plug is tightened to create a fresh, reliable seal between the plug and the sump. That crush action takes up tiny imperfections in the mating surfaces, preventing weeps and drips that can muck up the driveway or slowly drop the oil level. It also allows the correct torque to be reached without over-tightening, which helps protect the alloy sump threads.

Because crush washers are designed for one-time compression, they should be replaced at every oil change. Reusing an old washer can lead to weeping around the plug, oily smells after a run, or even a loose-feeling plug at the next service. For the 2006 Outlander, a quality 14 mm aluminium or copper crush washer is the go. Genuine-type replacements (as catalogued under MD050317 in Mitsubishi EPC) or reputable aftermarket equivalents both do the trick.

Good practice for servicing this Outlander includes:

• Have a new 14 mm crush washer on hand before draining the oil.
• Inspect the drain plug head and threads, replace the plug if the sealing face is gouged.
• Lightly clean the sump seat, avoid abrasives that could dish the surface.
• Tighten the plug to the service manual spec (about 39 N·m), not “as tight as possible”.
• After warm-up, check for any seepage around the plug.

If caught short, an old washer might be reused once, but it’s not best practice. For peace of mind in Aussie and Kiwi conditions—big temperature swings, long highway runs—swapping the washer at each service is cheap insurance against leaks and stripped threads. Always confirm fitment by VIN if unsure, as regional specs can vary.

FAQs

What size sump plug washer does a 2006 Mitsubishi Outlander use?
Most 2006 Outlanders with the 4G6-series petrol engines use a 14 mm crush washer on the oil drain plug, commonly referenced in Mitsubishi parts catalogues as MD050317. It’s typically aluminium or copper and is designed to deform once for a proper seal.

If your vehicle is a different regional spec or engine variant, double-check by VIN or measure the existing plug’s shank diameter to confirm 14 mm.

How often should the sump plug washer be replaced?
Replace it at every oil change. Crush washers are one-time-use, reusing them can lead to weeping and incorrect torque on the drain plug. Given how inexpensive they are, swapping it each service is the smart move.

After fitting a fresh washer, tighten the plug to the service manual torque (about 39 N·m) and recheck for any signs of seepage after the first warm run.

Can a fibre or rubber washer be used instead of a crush washer?
Stick with the specified crush washer material (aluminium or copper). Fibre or rubber styles may not handle engine heat cycles or match the sump seat profile on the Outlander, increasing the risk of leaks.

If only a different type is available in a pinch, treat it as temporary and replace with the correct crush washer at the earliest opportunity.