Relief-Flow Aluminium Oil Cooler for Jaguar V12 XJS / XJ12 – Part No: C43923
🚗 Vehicle Compatibility
Suitable for the following Jaguar V12 applications using the Relief Flow oil cooling system:
Jaguar XJS V12 – Pre-Facelift (1975–1991)
Jaguar XJ12 Series 1, 2 & 3
Jaguar XJ6 (V12 oil cooler–compatible models)
OEM Reference (this item): C43923
Fullflow System Equivalent (NOT this item): CBC2692
🔧 Relief Flow vs Fullflow – How to Identify Your System
✔ If one of your oil cooler pipes returns to the front of the sump → You have the Relief Flow system (this cooler).
✔ If both pipes return to the oil filter housing → You have the Fullflow system (CBC2692).
System Type
Pipe Routing
Correct Cooler
Relief Flow
One pipe returns to the sump
C43923 (THIS ITEM)
Fullflow
Both pipes return to filter housing
CBC2692 (Different item)
⚠️ Please message before purchasing — we must confirm whether your Jaguar uses the Relief Flow (C43923) or Fullflow (CBC2692) system.
🏭 Product Details
This uprated aluminium Relief-Flow oil cooler is manufactured to OEM specification for classic Jaguar V12 engines. Designed to provide stable oil temperatures and reliable performance in standard or warm-climate operating conditions.
Key Features:
High-quality aluminium construction
Optimised cooling for stable oil temperatures
Fully TIG-welded for strength and longevity
OEM-specification fitment for Relief Flow systems
Ideal for classic restorations and long-term reliability
This is an OEM-spec unit equivalent to the cooler supplied originally by Jaguar.
📦 Condition & Availability
Condition: Brand New
Availability: Made to Order – 14 Working Days Lead Time
🛡 Warranty & Support
Includes a 12-month warranty. Our team can confirm your oil system type and guide you through safe installation.
🚚 Delivery Information
UK Shipping: Fast, tracked courier delivery
International Shipping: Available on request
Import Duties & Taxes: Buyer responsible where applicable
🔍 Compatibility & Fitment Help
Not sure whether your Jaguar uses the Relief Flow (C43923) or Fullflow (CBC2692) cooler? Send us your VIN or a photo of your pipe routing and we will confirm before purchase.
📩 Custom Requests
We manufacture custom, specialist, and motorsport-grade oil coolers for a wide range of classic Jaguar models. Contact us for tailored cooling solutions.