Parts for your 1998 Mitsubishi Pajero-Oil cap

1998 Mitsubishi Pajero oil-cap — what it does and how to look after it

Technical sources including the 1998 Mitsubishi Pajero/Montero Owner’s Manual (lubrication section) and the Mitsubishi Factory Service Manual for the 6G72/6G74 petrol and 4M40 diesel engines show a threaded oil filler cap fitted on the cam/rocker cover. That means the oil-cap is absolutely relevant and used on all 1998 Pajero engines, serving as the primary access point for topping up engine oil and sealing the crankcase from dust, moisture, and oil splash under the bonnet.

The oil-cap’s job is straightforward but crucial. It seals the engine’s oil fill neck, keeping contaminants out and oil vapour and splash in. A good cap, with a healthy rubber seal, helps the crankcase ventilation system do its thing, supports stable idle quality (particularly on petrol engines), and prevents annoying oil mist around the top of the engine. On the 1998 Pajero, the cap is labelled for easy spotting and is designed to be hand-tightened only.

As part of regular servicing, the oil-cap deserves a quick once-over. Sensible habits include:

• Inspecting the rubber gasket/O-ring each service (about every 10,000 km or 6 months, typical local practice). If it’s flat, brittle, or cracked, replace the cap or the seal.
• Wiping the cap and filler neck threads clean to stop grit getting into the engine.
• Fitting the cap hand-tight until it seats