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).

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.