• Black 1KD Oil Cap - HPD
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HPD Special Parts

HPD 4JJ1 / 4JJ3 Billet Oil Cap

HPD 4JJ1 / 4JJ3 Billet Oil Cap

(1)

$91.50 AUD
$91.50 AUD
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Colour: Black
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HPD Billet Oil Cap – 4JJ1 / 4JJ3

 

🚚 Free Express AU 💳 Afterpay • Humm • Klarna • Zip 🛠 Direct Replacement

 

Upgrade your 4JJ engine bay with the HPD Billet Oil Cap — CNC-machined alloy, anodised for durability, and finished with the clean HPD Special Parts styling Thailand is known for. A fast, direct swap that looks the part and lasts.

🧩 Overview

This billet oil cap replaces the standard plastic filler cap with a tougher, premium-grade aluminium alternative. Designed for longevity, heat resistance and a clean look across any 4JJ build.

🔧 Suits / Compatibility
  • Isuzu 4JJ1 — all variants
  • Isuzu 4JJ3 — all variants (incl. MU-X & BT-50 4JJ3)

Direct swap using the OEM seal interface.

✨ Features
  • CNC-machined billet aluminium construction
  • Heat-resistant anodised finish
  • Premium Thai design by HPD Special Parts
  • Direct replacement for factory filler cap
📦 What’s Included
  • 1 × HPD Billet Oil Cap
  • 1 × Replacement O-ring seal
🛠 Install Notes
  • Remove factory filler cap
  • Inspect seal; replace with supplied O-ring if needed
  • Hand-tighten only — no tools required
⚠ Important Notes
  • Anodised colours may vary slightly between batches
  • Allow engine to cool before removing factory cap
💳 Payment & 🚚 Shipping
  • Afterpay, Humm, Klarna & Zip available
  • Free Express Shipping Australia-Wide
  • Same-day dispatch on in-stock colours

❓ FAQs

Will this fit both 4JJ1 and 4JJ3 engines?
Yes — it’s a direct swap for all 4JJ1 and 4JJ3 variants, including MU-X and BT-50.
Do I need to use the supplied O-ring?
Only if your factory seal is worn or damaged. Most installs reuse the OEM seal.
Is this upgrade just cosmetic?
It looks good, but it’s also far more durable than the OEM plastic cap.
What colours do these come in?
Colours depend on the anodising batch — check stock options for availability.
Does this improve engine performance?
No — this is a reliability and appearance upgrade, not a performance part.
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