Audi 3.0T Gen 1 Thermostat Housing - Billet Aluminum Upgrade

Billet Aluminum Thermostat Housing for Audi 3.0T Gen 1 Supercharged Engines – Replaces OEM 06E121111AL

Upgrade your Audi B8 S4, B8 S5, B8.5 S4, B8.5 S5, B8.5 Q5, B8.5 SQ5, C6 A6, C7 A6, A7, A8, or Q7 with our precision CNC-machined billet aluminum thermostat housing. Designed to replace the failure-prone factory plastic unit, this direct OEM replacement eliminates cracking, warping, and coolant leaks common with the stock 3.0T TFSI thermostat housing.

Watch the Installation:

VERSION 2 NOW AVAILABLE
We've made two major upgrades to further refine our CNC-machined thermostat housing:

1. Resolved Overcooling in Cold Climates – Version 2 addresses the overcooling issue reported by some customers, particularly in colder environments. If you purchased a Version 1 unit, contact us and we'll send you a free retrofit kit.
2. Improved Screw Placement – Assembly screws have been repositioned outside the O-ring groove to eliminate the risk of hardware falling into the engine block in the rare event of loosening.

Why Upgrade from Factory Plastic?

The factory Audi 3.0T thermostat housing (part number 06E121111AL) is a known weak point in the supercharged TFSI engine. Common failures include:

• Coolant leaks from cracked plastic housing
• Warped mating surfaces causing poor sealing
• Brittle material degradation over time

Our billet aluminum thermostat housing eliminates these issues with aerospace-grade 6061-T6 aluminum construction and hard anodized finish for superior durability and reliability.

Available in Two Options:

• Thermostat Housing Only
  Ideal for those using their own thermostat insert (e.g., Mishimoto Racing Thermostat). Click HERE for the Thermostat Housing Only install video.
• Complete Thermostat Assembly
  Fully pre-assembled and drop-in ready for hassle-free installation.

Features:

• CNC-machined from solid 6061-T6 billet aluminum
• Hard anodized finish for corrosion resistance
• Direct bolt-on replacement for OEM part 06E121111AL
• Precision-engineered in the USA
• Compatible with OEM and aftermarket thermostats
• Includes all necessary gaskets and hardware (complete assembly option)

Compatible Engine Codes: CAKA, CCAA, CCBA, CCDA, CGWA, CGWB, CGXC, CRED, CREC, CTUA, CTUB

Inspired by shopdap.com's list of Common Issues with 3.0T (Supercharged) TFSI Audi Engines.

Compatibility

Audi 3.0T Gen 1 Supercharged TFSI Engines