Parts for your 2005 Mitsubishi Pajero-Sump plug washers

2005 Mitsubishi Pajero sump plug washers — what they do and when to replace them

Yes, the 2005 Mitsubishi Pajero is fitted with a sump plug washer, and it’s an important little bit of kit. Mitsubishi’s own technical literature calls it out: the Pajero Workshop Manual for the 2000–2006 models (Group 11A—Engine Lubrication, Engine Oil replacement) instructs technicians to renew the drain plug gasket during oil changes. The Mitsubishi ASA electronic parts catalogue for NP-series Pajero (V8/V9 platform) also lists a dedicated “GASKET, OIL PAN DRAIN PLUG” for both the 3.2 Di‑D (4M41) and the petrol V6 (6G75) engines. In other words, the sump plug uses a crush-type sealing washer and it’s there by design to prevent leaks.

On a 2005 Pajero, the sump plug washer is a crush washer (typically aluminium, sometimes copper) that deforms slightly as the plug is tightened. That controlled crush creates a reliable seal between the plug and the sump, helping keep oil where it belongs and protecting the softer sump face from galling. Without a good washer, even a correctly tightened plug can mist or drip, which is messy, can trigger WOF/rego issues, and risks low oil level if ignored.

As part of routine servicing, it’s smart to replace the sump plug washer at every oil change. Genuine Mitsubishi washers are sized for the plug (commonly M14 on 2005 Pajero engines) and are inexpensive. Aluminium is the usual OE choice for Pajero, copper works too but is best replaced rather than annealed. Always torque the plug to the factory spec in the service manual rather than “by feel”.

• Replace the washer at each oil change or any time the plug is removed.
• Clean the plug and sump seating face before refitting, fit the new washer the right way up if it’s stepped.
• Tighten to the specified torque, over-tightening can distort the washer or stress sump threads.
• After the first drive, check for any weeping and nip up only if necessary to spec.
• Keep a few spare M14 crush washers in the glovebox or toolbox for stress-free servicing.

For both diesel and petrol 2005 Pajero variants, a fresh, correct-size crush washer is cheap insurance against oil leaks and thread damage. It’s a small part that makes a big difference to clean, dependable servicing.

Popular questions about 2005 Mitsubishi Pajero sump plug washers

Does a 2005 Pajero actually have a sump plug washer?
It does. Mitsubishi’s Workshop Manual for the 2000–2006 Pajero platform specifies renewing the drain plug gasket during oil changes, and the Mitsubishi ASA parts catalogue lists the washer as a separate, replaceable item for both 4M41 diesel and 6G75 petrol engines. If the plug’s coming out, the washer should be replaced.

What size and material washer should be used?
Most 2005 Pajero models use an M14 crush washer on the sump plug. The genuine part is typically aluminium, which crushes predictably and seals well. Quality copper crush washers also work, but stick with the correct M14 size and avoid generic fibre washers. When in doubt, confirm by VIN/engine code or measure the plug shank.

Can the sump plug washer be reused?
It’s not recommended. Crush washers are designed for single use, once compressed, they don’t spring back to shape. Reusing one risks weeping or a slow drip. In a pinch, a recently fitted copper washer might seal again, but best practice on a Pajero is to fit a fresh washer every oil change and torque the plug to spec.