Radium Baffled Oil Cap - Holden Commodore / HSV LSX V8

Confirmed Engine Compatibility:

• LS1, LS2, LS3, LS4, LS6, LS7, LS9, LSA
• L76, L99, L9H
• LT1, LT2, LT4

Note: Other compatible engines not listed above may also be supported.

The Radium Engineering Baffled Oil Cap is an anodised billet aluminium direct replacement for the OEM oil cap on LSX and LT-series V8 engines. Designed to consolidate the two different oil cap styles used across LS-based engines, this cap features a top-mounted 7/8"-14 threaded port (10AN ORB) and an internal stainless steel baffle for crankcase venting air/oil separation.

Out of the box, the 10AN ORB port is plugged — making this a direct drop-in replacement with no additional parts required. Optionally, the plug can be removed to expose the cleanable and reusable stainless steel baffle, allowing the cap to be used as part of a custom crankcase venting setup.

Features

• Direct OEM oil cap replacement — no modifications required
• Anodised billet aluminium construction
• Top-mounted 7/8"-14 threaded port (10AN ORB) — accepts standard 10AN ORB adapter fittings
• Internal cleanable and reusable stainless steel baffle for air/oil separation
• Includes 10AN ORB plug to block off the baffle port when not in use
• Compatible with both LS-style oil cap fitments

Optional Crankcase Venting

Remove the 10AN ORB plug to expose the stainless steel baffle and connect a 10AN ORB fitting of your choice to create a custom crankcase venting setup. Compatible with Radium catch cans, roll-over valves, and other 10AN ORB crankcase vent accessories.

Part Number:

• 20-0539 — Radium Baffled Oil Cap (Holden Commodore / HSV LSX V8)

Why Radium Engineering?

• ✅ Manufactured in the USA to motorsport-grade tolerances
• ✅ CNC-machined billet aluminium components built for performance and longevity
• ✅ Trusted by high-power build tuners and race teams worldwide
• ✅ Bolt-on fitment — no cutting, drilling, or fabrication required
• ✅ Compatible with E85, pump petrol, and flex fuel builds across the full LS and LT platform range