Thermostat Oil Cooler Adapter Spec C for Subaru 21679AA020

The Thermostat Oil Cooler Adapter Spec C (SKU: 21679AA020) is a genuine Subaru oil cooling system component developed for high-performance Spec C applications. It functions as a thermostatic oil cooler control valve, regulating engine oil flow to the external oil cooler based on oil temperature. This helps the engine reach optimal operating temperature more quickly while maintaining stable oil temperatures during demanding driving conditions and motorsport use. Manufactured according to Subaru factory specifications, it provides precise fitment, reliable thermal control and long-term durability for performance-oriented EJ-series engines.

Compatibility:
– Subaru Impreza WRX STI Spec C 2001–2007
– Subaru EJ207 performance applications equipped with OEM external oil cooler systems
– Compatible with Spec C oil cooler adapter assemblies using part number 21679AA020

Function:
– Thermostatic oil cooler adapter / oil cooler control valve
– Regulates oil flow to the external oil cooler depending on oil temperature

Manufacturer: Subaru
SKU: 21679AA020