Parts for your 1988 Mitsubishi Pajero-Oil cap

1988 Mitsubishi Pajero Oil Filler Cap: What It Does and How To Look After It

Yes, the 1988 Mitsubishi Pajero uses an oil filler cap. Technical references such as Mitsubishi’s factory service manuals and period owner’s manuals for first‑generation Pajero/Montero models show a dedicated oil filler cap on the valve/rocker cover across common 1988 engines (4D56 2.5 turbo‑diesel, 4G54 2.6 petrol, and 6G72 3.0 V6). It’s a required component for sealing the crankcase and topping up engine oil.

On this Pajero, the oil filler cap does two simple but critical jobs: it seals the top of the engine to keep grit and moisture out, and it helps maintain correct crankcase ventilation so the PCV system can do its thing. It’s also the spot you crack open when adding a litre of oil under the bonnet. Most caps are plastic or metal with a rubber O‑ring or gasket that compresses against the rocker cover. If that seal hardens or the cap doesn’t tighten properly, you’ll often see a light oil mist or weeping around the top of the cover.

Replacement and maintenance are straightforward. Keep the seating surface clean—wipe away dust before removing the cap so nothing falls into the engine. Always refit the cap hand‑tight