
HEL Thermostatic Oil Filter Sandwich Plate
HEL part number HEL-TOSP
- 82°C / 180°F
- Hot Climates & Extreme Racing Conditions
- 92°C / 198°F - Most Common
- Mixed Climates & Fast Road/Track Use
- 102°C / 216°F
- Cold Climates
- Component Type
- Oil Filter Sandwich Plate
- Includes Thermostatic Valve?
- Yes
- Thermostat Temperature
- 82°C / 180°F, 92°C / 198°F or 102°C / 216°F
- Length (Excl. Adapters)
- 80mm / 3.15"
- Width (Widest Point, Incl. Thermostat Cap)
- 87.3mm / 3.44"
Product details
- Thickness (Excl. O-Ring)
- 32mm / 1.26"
- Weight (Excl. Adapters)
- 278g / 0.61lbs
- Min. Oil Filter O-Ring Diameter
- 52mm / 2.04"
- Max. Oil Filter O-Ring Diameter
- 75mm / 2.95"
- Inlet/Outlet Port Thread
- M22 x 1.5
- Centre Bolt Thread
- M20 x 1.5 or 3/4"-16 UNF
- Includes O-Ring?
- Yes - Nitrile
- Includes Sensor Port?
- None
- Colour
- 'HEL' Grey
- Finish
- Hard Anodised
- Material
- 6082-T6 Aluminium
HEL Performance produces a range of oil system components used across both motorsport and road driving.
HEL carries out CNC machining in-house across its oil system component range, giving it direct control over manufacturing quality. HEL states this supports durability even in demanding conditions.
This thermostatic sandwich plate offers a choice of centre bolt options and thermostat temperatures. Its built-in thermostat holds back oil flow to the external cooler until the set operating point is reached, supporting quicker warm-up and extra cold-weather protection versus non-thermostatic versions.
Once the oil hits its selected switching point of 82°C, 92°C or 102°C, an internal valve opens and lets oil flow to the external cooler, which is typically finned and sometimes fan-assisted for heat dissipation. Roughly 10% of the oil is routed through the cooler at any moment, keeping a steady flow that avoids air pockets and thermal shock. The rest returns to the engine or transmission via the internal bypass, helping the system warm up quickly without overcooling.
These sandwich plates use M22 x 1.5 threaded inlet and outlet ports, which adapt easily to -8 (AN08) or -10 (AN10) male fittings and work with numerous AN-style hoses and adapters. Centre bolts are stainless steel, available in M20 x 1.5 or 3/4"-16 UNF to suit most common spin-on filters.
This is a universal sandwich plate that fits a range of engine blocks. Check the technical drawings in the downloadable manual to confirm fitment for a specific application.
Choosing a Thermostat Temperature
Technical Details
HEL's oil system spares and accessories range also includes replacement thermostats, o-rings, and other components.
Kit Contents
- HEL universal thermostatic oil filter sandwich plate x1
- Built-in thermostatic valve x1
- Threaded centre bolt x1
- Nitrile O-ring x1
Important Note
Before the vehicle is driven, whoever fits this part must confirm that every component is torqued and secure. Not doing so could cause oil loss or, in a worst case, engine failure.

























































