Parts for your 2000 Mitsubishi Pajero-Sump plug washers

2000 Mitsubishi Pajero sump plug washers — purpose, fitment and servicing tips

Yes, the 2000 Mitsubishi Pajero uses a sump plug washer (also called a drain plug gasket), and it’s a service item. This is supported by Mitsubishi’s NM/NL Pajero Workshop Manual (Group 11A – Engine Lubrication), which specifies replacing the drain plug gasket whenever the engine oil is changed. The Mitsubishi ASA electronic parts catalogue for NM-series Pajero (2000 model year) lists a 14 mm crush-type drain plug gasket (commonly referenced as MD050317) for both the 3.5L V6 (6G74) and the 3.2L Di‑D diesel (4M41). General service manuals covering Pajero/Montero/Shogun models of this era also instruct refitting with a new sealing washer at each oil change.

The sump plug washer’s job is simple but critical: it provides a soft, deformable seal between the steel drain plug and the alloy or steel sump. When tightened, the copper or aluminium washer “crushes” slightly to fill microscopic gaps, preventing weeps and drips. It also helps protect the sump threads by allowing proper sealing at the specified torque rather than relying on extra muscle.

For a 2000 Pajero, a 14 mm ID crush washer is typically used. Copper and aluminium are both common, either is fine if it’s the correct size and spec. Because these washers are designed to deform once, they should be replaced at every oil change. Reusing a flattened or grooved washer can lead to slow leaks, oil smells on hot exhausts, and oily undersides.

Good practice during servicing includes cleaning the sump face and plug, hand‑starting the plug to avoid cross‑threading, and tightening to the workshop manual torque (varies by engine, generally in the 30–40 N·m range—always check the spec for the exact engine code). Avoid stacking washers or using sealant, neither is needed with the right new crush washer.

• Replace the washer at each oil change (every 10,000–15,000 km or as per schedule).
• Inspect for nicks on the sump face, lightly dress only if needed.
• If caught short, a copper washer can be annealed as a temporary measure, but a new washer is the proper fix.

Owners who stick to a new washer each service will avoid nuisance leaks, keep the Pajero’s underbody tidy, and protect the sump threads for the long haul.

Popular questions about 2000 Mitsubishi Pajero sump plug washers

What size sump plug washer does a 2000 Pajero use?
Most 2000 NM-series Pajeros use a 14 mm internal-diameter crush washer. Mitsubishi parts catalogues commonly list a 14 mm copper/aluminium gasket for both the 3.5L petrol and 3.2L diesel. It’s wise to confirm against the VIN or engine code before buying.

How often should the washer be replaced?
Every oil change. The workshop manual calls for replacement at each refit because the washer deforms once to seal. Reusing can cause weeping, especially after a few heat cycles.

Can the old washer be reused in a pinch?
If absolutely necessary, a copper washer can be heat-annealed as a stopgap, but it’s not best practice. The correct new crush washer is inexpensive and gives reliable sealing at the specified torque.