• Black 1KD Oil Cap - HPD
  • Green 1KD Oil Cap - HPD
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HPD Special Parts

HPD 4JJ1 / 4JJ3 Billet Oil Cap

HPD 4JJ1 / 4JJ3 Billet Oil Cap

(1)

$110.00 NZD
$110.00 NZD
Sale Sold out

Taxes excluded. Shipping calculated at checkout.

Colour: Black

🔥 HPD Billet Oil Cap – 4JJ1 / 4JJ3

 

Anodised HPD Special Parts – Made in Thailand 🇹🇭

✅ CNC-Machined | ✅ Heat-Resistant Anodised Finish | ✅ Direct Replacement | ✅ Free Express AU Shipping

🧩 Product Overview

Level up your engine bay with the HPD Billet Oil Cap — crafted from high-grade aluminium and anodised for a clean, durable finish. Built for performance and aesthetics, it’s the perfect finishing touch for your 4JJ build.

🔧 Suits
  • ✅ Isuzu 4JJ1 — all variants
  • ✅ Isuzu 4JJ3 — all variants (incl. MU-X and Mazda BT-50 4JJ3)
Direct swap for the factory oil filler cap — uses OEM seal interface.
✨ Key Features
  • ✔️ CNC-machined billet alloy for strength and precision
  • ✔️ Heat-resistant anodised finish for durability
  • ✔️ Exotic Thai design — standout engine bay look
  • ✔️ Direct replacement — quick install, no mods
🧼 Finish & Care
  • Wipe with a soft microfiber; avoid harsh chemicals/abrasives.
  • Allow engine to cool before removal/installation.
🛠️ Install Notes
  • Remove factory cap and fit the HPD cap by hand until snug.
  • Check seal condition; replace the OEM seal if worn.
💳 Payment & 🚚 Shipping
  • 💳 Afterpay, Humm, Klarna & Zip available
  • ✈️ Free Express Shipping Australia-Wide — fast, trackable dispatch

❓ FAQs

Will this fit both 4JJ1 and 4JJ3 engines?
Yes — it’s a direct replacement for all 4JJ1 and 4JJ3 variants, including MU-X and BT-50 4JJ3 models.
Do I need a new seal or O-ring?
A new O-ring seal is included. Use it if your factory seal is worn or cracked to ensure a proper seal.
Is this just cosmetic or does it add function?
Primarily cosmetic. It offers improved durability (billet alloy, anodised finish) and tighter machining tolerances compared to plastic caps.
What colours are available?
Availability varies by batch. Check the product options on this page or contact us for current anodised colour stock.
What’s the warranty?
12-month warranty against manufacturing defects. Improper installation, misuse, or cosmetic wear are not covered.

Common Rail Cowboys is not affiliated with Isuzu Motors. Fitment and compliance are the buyer’s responsibility.

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