Parts for your 1999 Daihatsu Gran move-Oil cap

1999 Daihatsu Gran Move Oil Cap — what it does and how to look after it

Yes, the 1999 Daihatsu Gran Move absolutely uses an engine oil filler cap. Technical references that confirm this include the Daihatsu Gran Move/Pyzar owner’s manual (1997–1999 runs), which labels the oil filler cap in the engine-bay layout and instructs removing it to top up oil, the Daihatsu service manual for HC-EJ and K3-series engines, which specifies the cap’s removal during lubrication procedures, and the Daihatsu electronic parts catalogue (EPC) for Gran Move model codes, which lists a “cap, oil filler” and its sealing gasket as service items. So the oil cap is relevant, fitted, and essential on this model.

On the Gran Move, the oil cap sits on top of the cam/rocker cover under the bonnet, marked “Engine Oil.” Its job is simple but critical: it seals the engine’s oil fill point to keep oil in, contaminants out, and crankcase ventilation behaving properly. A sound cap helps maintain correct oil pressure dynamics and stops oil mist from weeping across the top of the engine.

As part of regular servicing (every 10,000 km or 6 months is a sensible cadence for these late-’90s Daihatsus), the cap deserves a quick once-over. Wipe the area clean before removing it, check the rubber O-ring for hardening or cracks, and make sure the threads turn smoothly. Refit it hand-tight only—no need to lean on it with a spanner. If there’s oil film around the cap, a burnt-oil whiff after a drive, or the cap feels loose or warped, it’s time to replace it.

Replacement is straightforward. Choose a quality cap matched to the Gran Move’s engine code (HC-EJ 1.3L or K3-series 1.5L, depending on the variant). The cap on these engines is a sealed, non-vented design, relying on the PCV system for breathing, so using a vented or ill-fitting universal cap can cause idle issues and oil misting. A genuine or reputable aftermarket cap with the correct seal height and thread is the go.

Left off or left leaking, the cap can fling oil under the bonnet, drop the oil level quickly, and draw unmetered air into the crankcase, which can upset fuelling. For peace of mind, keep a spare O-ring in the glovebox, replace the cap if it’s damaged, and always refit it before starting the car after a top-up.

• Signs the oil cap needs attention: visible oil around the cap, perished O-ring, fuelly or oily odour after driving, cap won’t tighten securely, or cracked plastic.
• Quick tip: if topping up oil on the roadside, use a clean rag to stop grit dropping in, and refit the cap immediately after filling.

Popular questions about 1999 Daihatsu Gran Move oil caps

Where is the oil cap located on a 1999 Daihatsu Gran Move?
It’s on top of the engine’s cam/rocker cover under the bonnet, clearly marked “Engine Oil.” Twist anti-clockwise to remove. On these transverse engines it’s right up top and easy to spot without removing any covers.

Will a universal oil cap fit the Gran Move?
Sometimes, but it’s not recommended. The Gran Move uses a sealed, non-vented cap with a specific thread and seal height. A mismatched universal cap can leak or upset crankcase ventilation. Use a genuine cap or a quality aftermarket part matched to the HC-EJ or K3-series engine.

Is it safe to drive without the oil cap?
No. Driving without the cap can spray oil around the engine bay, drop the oil level fast, and let unmetered air into the PCV system, causing rough running. Always refit the cap before starting the engine.