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The Genuine Subaru OEM Oil Cooler Adapter (Part #21684AA000) is a factory-original component designed to connect the engine oil cooler to the engine block on select turbocharged Subaru models. Built to exact OEM specifications, this adapter ensures a precise fit and reliable seal, maintaining optimal oil temperatures for engine longevity. It is the ideal replacement for worn, damaged, or leaking oil cooler adapters on the 2004–2006 Baja, 2004–2007 Forester XT, and 2006–2007 WRX.
| Part Number | 21684AA000 |
|---|---|
| Brand | Genuine Subaru OEM |
| Component | Oil Cooler Adapter |
| Engine Compatibility | EJ-series Turbocharged (EJ255) |
| Condition | New, Genuine OEM |
This Genuine Subaru OEM Oil Cooler Adapter is compatible with the following vehicles:
2004-2006 Subaru Baja
2004-2007 Subaru Forester XT
2006-2007 Subaru WRX
Always verify your vehicle's year, model, and trim level before ordering. Cross-reference with OEM part number 21684AA000 for confirmation.
This oil cooler adapter is a direct bolt-on replacement for the factory unit. Installation involves draining engine oil, removing the oil filter, detaching the oil cooler lines, and unbolting the existing adapter before installing the new unit with fresh sealing hardware (gaskets/O-rings may be sold separately — confirm with your service manual). While a mechanically experienced DIYer can perform this job, professional installation by a Subaru-certified technician is recommended to ensure proper torque specs and a leak-free seal on turbocharged applications.
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