Parts for your 1998 Daihatsu Gran move-Oil cap

1998 Daihatsu Gran Move oil cap — what it does and how to look after it

Technical sources confirm the 1998 Daihatsu Gran Move is fitted with an engine oil filler cap and absolutely relies on it. The Daihatsu G300-series Workshop Manual (Gran Move/Pyzar), the factory Electronic Parts Catalogue for G30# models, and the 1998 Owner’s Manual all specify a screw-in, sealed oil filler cap mounted on the cam/rocker cover. So an oil-cap is relevant and used on this vehicle.

On the Gran Move, the oil cap’s job is simple but critical: it seals the top of the engine so fresh oil can be added cleanly, and it keeps dust, moisture, and grit out of the crankcase while the engine breathes via the PCV system. With a good seal, the engine maintains the right crankcase conditions and avoids oily mist under the bonnet. If the cap’s gasket hardens or the cap goes missing, expect oil seepage, smells, and the risk of unfiltered air being drawn into the engine.

As part of regular servicing in Australia and New Zealand, it’s a good shout to check the Gran Move’s oil cap every time the oil and filter are changed (typically every 10,000 km or 6 months, depending on use). The cap on G30-series engines is a screw-in type with a rubber sealing ring. Hand-tight is all that’s needed—no tools—just a firm nip until the gasket seats. A light wipe of clean engine oil on the gasket helps it seal and come off easily next service.

• Replace the cap if the rubber seal is cracked, flattened, or missing.
• Look for oil mist or weeping around the cap area, it’s a sign the seal isn’t doing its job.
• Avoid cross‑threading—start the cap gently and turn it clockwise by hand.
• Stick with an OEM or quality aftermarket cap matched to the engine code to ensure the correct seal height and thread.

If the original cap’s gone walkabout, don’t drive far without one. Oil can splash out and dust can get in, which is rough on bearings and cam gear. Fit the correct replacement as soon as possible. A fresh cap with a soft, pliable gasket is cheap insurance for the Gran Move’s long‑lived little four.

Popular questions about 1998 Daihatsu Gran Move oil caps

Where is the oil cap on a 1998 Daihatsu Gran Move?
It sits on top of the engine’s cam/rocker cover under the bonnet, typically marked “Engine Oil”. It’s easy to spot and unscrews by hand for top‑ups and servicing.

Can the Gran Move be driven without an oil cap?
Best not. Without the cap, oil can flick out and unfiltered air can be drawn into the engine. If the cap is missing, fit the correct replacement before regular driving, only move the car a short distance if absolutely necessary.

How often should the oil cap be replaced?
There’s no fixed interval, but it should be inspected at every service. Replace it when the gasket hardens, the cap cracks, or if there’s persistent oil weep around the filler point.