Parts for your 2009 Mitsubishi Outlander-Sump plug washers

2009 Mitsubishi Outlander — Sump Plug Washers

Yes, the 2009 Mitsubishi Outlander uses a sump plug washer (also called an oil drain plug gasket). Technical sources that back this up include the Mitsubishi Outlander 2007–2010 Workshop Manual (Group 11A – Engine Lubrication), which specifies replacing the drain plug gasket during engine oil changes, and Mitsubishi’s ASA electronic parts catalogue, which lists a separate, replaceable drain plug gasket for the 2009 Outlander engines (such as the 2.4L petrol 4B12 and 3.0L V6 6B31). Major aftermarket catalogues in Australia and New Zealand also list an M14 aluminium crush washer for this model.

On the Outlander, the sump plug washer’s job is simple but critical: it’s a soft, crush-style gasket that deforms slightly as the sump plug is tightened, sealing the plug to the alloy sump without needing brute force. That controlled “crush” prevents slow weeps, protects the sump threads, and keeps engine oil exactly where it should be.

Best practice on this model is to fit a new washer at every oil change. Reusing a crush washer is a false economy, once it’s flattened, it won’t spring back to give a proper seal. Go for an OEM-spec aluminium (or copper) M14 crush washer that matches the plug and sump seat. When servicing, clean the mating face on the sump, spin the plug in by hand first to avoid cross-threading, then tighten to the factory torque (typically in the 30–40 N·m range, check the exact spec for the engine variant). No thread tape or sealant is needed when the correct washer is fitted and torqued correctly.

• Replace the washer at each oil and filter change.
• Swap it immediately if there’s any oil seepage or staining around the plug.
• Avoid over-tightening, let the crush washer do the sealing.

If a previous overtighten has gouged the sump face or crushed the washer right through, the fix is a new washer plus careful inspection of the sealing surface. Keeping a small pack of quality M14 washers on hand makes Outlander servicing straightforward and tidy — no drips on the driveway, no top-ups between services, and no risk of stripped threads from chasing a seal with extra grunt.

Popular questions about 2009 Mitsubishi Outlander sump plug washers

What size washer does a 2009 Outlander use?

It typically uses an M14 crush washer (approximately 14 mm internal diameter). Because there are engine variants, it’s smart to confirm by VIN or by checking the plug thread size before buying a pack.

Can the old washer be reused?

It’s not recommended. The Outlander’s washer is a crush type designed to deform once. Reusing it can lead to weeping oil or the temptation to over-tighten the plug, which risks damaging sump threads.

What torque should the sump plug be tightened to?

Expect a factory torque in the ballpark of 30–40 N·m, depending on engine. Always refer to the service data for your exact variant. Over-tightening doesn’t seal better, it can crush the washer excessively or strip the alloy sump.