Parts for your 2007 Mitsubishi Outlander-Sump plug washers

2007 Mitsubishi Outlander sump plug washers

Yes, the 2007 Mitsubishi Outlander uses a sump plug washer. Technical sources back this up: the Mitsubishi Motors Outlander service manual for the CW/ZG series specifies refitting the oil drain plug with a “new gasket” at each oil change, and the Mitsubishi ASA electronic parts catalogue lists a dedicated oil drain plug gasket (commonly the 14 mm aluminium type, e.g., MD050317) for CW5W/CW6W models with 2.0/2.4-litre 4B engines and the 3.0-litre 6B V6. AU/NZ aftermarket catalogues also match the Outlander to a 14 mm aluminium crush washer. So, a sump plug washer is absolutely relevant to this model.

On this Outlander, the sump plug washer is the small, single-use aluminium ring that sits under the drain plug head. Its job is simple but critical: it crushes slightly as the plug is tightened, creating a gas- and oil-tight seal between the plug and the sump. Without a fresh washer, owners are more likely to see weeping around the plug, drips on the driveway, and the risk of oil level dropping between services.

Best practice for the 2007 Outlander is to replace the sump plug washer at every oil change. They’re inexpensive, and using a new one helps avoid over-tightening the plug (which can strip threads or distort the sump face). Stick with the correct 14 mm aluminium crush washer specified for the vehicle. Copper can seal too, but Mitsubishi specifies aluminium for consistent crush and sealing performance on these engines.

When servicing, clean the sump plug and the sump sealing face with a lint-free rag. Fit a new washer, tighten the plug to the correct spec, and check for leaks after warm-up. Don’t stack old washers, don’t use thread tape, and don’t “double down” by overtightening. If a previous over-tighten has left a ridge on the sump face, address that before refitting. It’s smart to keep a small pack of the right washers on hand so they’re never skipped during a quick oil change.

• Telltales that the washer needs replacing: fresh oil mist around the plug, a slow drip after shutdown, or a plug that was over-tight to stop a seep last time.
• Pro tip: replace the plug’s sealing washer first, not the whole plug—unless the plug’s threads or magnet are damaged.

Popular questions

What size sump plug washer does a 2007 Mitsubishi Outlander use?
Most 2007 Outlanders (2.0/2.4 4B engines and 3.0 V6) use a 14 mm aluminium crush washer matched to the M14 drain plug. For absolute certainty, check the VIN in a Mitsubishi parts catalogue or match the old washer’s inner diameter and thickness.

How often should the sump plug washer be replaced?
Every oil change. It’s a single-use crush washer, designed to deform once for a reliable seal. Reusing it risks seepage, over-tightening, or damage to the sump face—none of which is worth the few dollars saved.

Can a copper washer be used instead of aluminium?
Copper can work if it’s the correct 14 mm size and in good condition, but Mitsubishi specifies aluminium for this model. If copper is used, ensure it’s soft (annealed) and be mindful that sealing feel and torque can differ slightly from aluminium.