• Replaces the standard plastic oil filler cap. Direct swap using the OEM seal interface, no modifications.
• CNC-machined billet aluminium. Made by HPD Special Part Racing Shop in Thailand.
• Heat-resistant anodised finish. Anodising is grown into the alloy, so it handles underbonnet heat better than paint.
• Hand-tighten install. No tools needed, and none should be used.
• Matches the rest of the HPD 4JJ range. Pick a colour that lines up with your other anodised parts.

• Isuzu 4JJ1. All variants. D-MAX, MU-X and Holden Colorado.
• Isuzu 4JJ3. All variants, including MU-X and the 4JJ3 Mazda BT-50.

Direct swap using the OEM seal interface. The filler neck is the same across the 4JJ family, so the cap does not care which badge is on the bonnet, only which engine is under it.

• This listing. Isuzu 4JJ1 and 4JJ3.
• Toyota 1KD-FTV 3.0L. N70 Hilux, Prado 120 and 150, Hiace. Use the 1KD HPD Billet Oil Cap.
• Toyota 1GD-FTV and 2GD-FTV. N80 Hilux, 2015 on. Use the 1GD N80 Hilux HPD Oil Cap.

• 1 x HPD billet oil cap.
• 1 x O-ring seal.

• Let the engine cool before you touch the factory cap. Hot oil vapour burns.
• Remove the factory filler cap.
• Inspect the seal. Most installs reuse the OEM seal. If yours is worn or damaged, fit the supplied O-ring instead.
• Hand-tighten only. No tools required. Snug it until the seal compresses and stop there.

• Injector cover. The HPD 4JJ1 Injector Cover covers the injector hard-line area.
• 4JJ3 bling kit. The HPD 4JJ3 Bling Kit.
• 4JJ1 Euro 3 bling kit. The HPD 4JJ1 Bling Kit, Euro 3 dual radiator brackets.

• Free express shipping Australia-wide.
• Dispatch: same-day on in-stock colours. Orders placed before 2 PM AEST on a business day go out the same day.
• Buy now, pay later: Afterpay, Humm, Klarna and Zip.

This is an appearance upgrade, not a performance part. Nobody has ever gained a kilowatt from an oil cap.

Anodised colours vary slightly between batches. If you are matching an existing HPD part, check the stock options or ask us before you order.

Q: Will this fit both 4JJ1 and 4JJ3 engines?

A: Yes. It is a direct swap for all 4JJ1 and 4JJ3 variants, including the MU-X and the BT-50.

Q: Do I need to use the supplied O-ring?

A: Only if your factory seal is worn or damaged. Most installs reuse the OEM seal.

Q: Is this just cosmetic?

A: Mostly, yes. The one practical difference is that alloy does not crack or go brittle the way an old plastic cap does.

Q: What colours do these come in?

A: It depends on the anodising batch. Check the stock options on this page for what is currently available.

Q: Does this improve engine performance?

A: No. It is an appearance and durability upgrade, not a performance part.

Q: I have a Toyota, will it fit?

A: No. This is the Isuzu 4JJ cap. The 1KD and 1GD caps are linked above.