Thermostatic Oil Filter Sandwich Plate – Precision Oil Temperature Control

Proper oil temperature is crucial for engine performance and longevity. Our thermostatic oil filter sandwich plate ensures faster warm-ups, prevents overcooling, and eliminates air pockets — making it the ideal upgrade for high-performance road and track cars.

Designed with a built-in and rebuildable thermostat, this UK-machined billet aluminium thermostatic sandwich plate controls oil flow to your cooler with precision. It fully opens when your selected activation temperature is reached, with a constant small bypass flow to prevent fluid shock and trapped cold oil.

Key Features

Oil Filter Thread Compatibility

Available in two common thread sizes to fit a wide range of engines:
- M20 x 1.5 – Standard for many European and Japanese engines.
- 3/4"-16 UNF – Compatible with various American and British engines.
Thermostat Activation Temperatures

Choose the optimal thermostat setting based on your driving conditions and climate:
- 82°C (180°F) – Ideal for hot climates and extreme racing.
- 92°C (198°F) – Suitable for mixed climates and fast road/track use.
- 102°C (216°F) – Best for cold climates.
Premium Billet Aluminium Construction

Expertly machined in the UK, this high-strength billet aluminium sandwich plate delivers durability and lightweight performance for demanding applications.
Optional AN Adapter Fittings

Upgrade your oil cooling system with premium AN fittings:
- AN8 – Compact setups with limited space.
- AN10 – Standard choice for most performance oil coolers.
- AN12 – High-flow applications requiring maximum cooling.

Why Choose a Thermostatic Sandwich Plate?

Maintaining the right oil temperature is essential for reliability and efficiency. A thermostatic sandwich plate:

Speeds up warm-ups, reducing engine wear.
Prevents overcooling, maintaining consistent oil viscosity.
Allows a small continuous flow through the cooler to eliminate air pockets.

Why Our Thermostatic Oil Filter Sandwich Plate?

Motorsport-Grade Engineering

Developed for high-performance road and track applications.
Hassle-Free Installation

Designed for a quick bolt-on fit with optional AN adapters for seamless integration.
Customisable for Your Setup

Multiple thermostat and fitting options allow for a custom cooling solution.
Proven Performance

Trusted by enthusiasts and professionals for superior oil temperature management.

Sandwich Plate: 1 x Thermostatic Oil Filter Sandwich Plate Supplied with the selected thermostat installed
Oil Filter Centre Bolt: 1 x Threaded Centre Bolt Supplied in the selected M20 x 1.50 or 3/4"-16 UNF oil filter thread
Oil Filter Seal: 1 x Nitrile O-Ring For sealing the sandwich plate against the engine oil filter mounting surface
Hose Adapters: Optional AN Hose Adapters Supplied in the selected AN6, AN8, AN10 or AN12 size when added to your configuration

Material: 6082-T6 Aluminium Lightweight, high-strength alloy
Finish: Grey Anodised Protects against wear and corrosion
Seal: Nitrile O-Ring Included Provides a secure seal against the engine oil filter mounting surface
Manufactured In: United Kingdom Precision CNC machined

Thermostat Type: Built-In Oil Thermostat Designed to regulate oil temperature in external oil cooler systems
Operation: Thermostatic Begins opening at the selected activation temperature and progressively opens as oil temperature rises
Oil Circulation: Continuous Bypass Flow Maintains a minimum oil flow through the cooler circuit during warm-up, helping reduce thermal shock

Oil Filter Centre Bolt Thread Options: M20 x 1.50 3/4"-16 UNF Select to match the engine's oil filter mounting thread
Oil Port Threads: M22 x 1.50 Two female threaded ports
Hose Connections: 2 Used for oil feed and return hose connections to the external oil cooler

Length: 80mm 3.15" · Excluding adapters
Width: 87mm 3.44"
Thickness: 32mm 1.26" · Excluding O-ring
Weight: 278g 0.61lb · Excluding adapters
Compatible Oil Filter O-Ring Diameter: 52–75mm 2.04–2.95"

Available thermostatic oil filter sandwich plate options
Activation Temperature
82°C 180°F
92°C 198°F
102°C 216°F

Engine Oil Coolers
Oil Cooler Systems
Track Cars
Performance Engines
Motorsport Oil Systems

Engine Oil

Choose adapters with an M22 x 1.50 thread on one end and the appropriate AN hose size on the other. Replacement thermostats, service kits and O-rings are also available.

Free repair or replacement for two years from the date of purchase. Learn more

Frequently Asked Questions

What is the Oil Filter Sandwich Plate with Thermostat used for?
This component is designed to be installed between the engine block and the oil filter, allowing for the integration of an external oil cooler. The built-in thermostat regulates oil flow to the cooler based on temperature, ensuring optimal oil operating conditions.
What oil filter thread sizes are available?
The sandwich plate is available in the following thread sizes to fit a wide range of engines:
- M20 x 1.5 – Standard for many European and Japanese engines.
- 3/4"-16 UNF – Compatible with various American and British engines.
What thermostat activation temperatures can I choose from?
You can select the thermostat activation temperature that best suits your driving conditions:
- 82°C (180°F) – Ideal for hot climates and extreme racing.
- 92°C (198°F) – Suitable for mixed climates and fast road/track use.
- 102°C (216°F) – Best for cold climates.
Are adapter fittings available?
Yes, optional AN adapter fittings are available for seamless integration with your oil cooler lines:
- 2x AN6 Male (+£13.62)
- 2x AN8 Male (+£14.68)
- 2x AN10 Male (+£17.82)
- 2x AN12 Male (+£20.98)
Is this sandwich plate compatible with your custom braided hoses?
Yes, the sandwich plate is fully compatible with our range of custom braided hoses, ensuring a secure and efficient connection for your oil cooling system.
Is the Oil Filter Sandwich Plate with Thermostat reusable?
Yes, the sandwich plate is designed for repeated use. It can be removed and reinstalled in different applications as needed, provided it remains in good working condition.