Only after the system is thoroughly cleaned should the new Subaru coolant be introduced. Subaru’s Organic Acid Technology (OAT) coolant, however, uses different chemical compounds that inhibit corrosion without the need for phosphates.
Subaru Orange Coolant Formula: Understanding the OEM Subaru Coolant Type
For the absolute safety of your investment, look for products specifically labeled for Subaru, Mitsubishi, or certain late-model Toyotas, as these manufacturers share similar coolant specifications. While some universal coolants claim to be "compatible," relying on these is risky.
The procedure requires filling the system with water, running the engine to operating temperature, and then draining it again to purge old debris. This sludge can obstruct the heater core, leading to a lack of cabin heat, or it can coat the water pump, leading to premature failure and overheating.
Subaru Orange Coolant Formula: Understanding the OEM Subaru Coolant Type
Subaru explicitly states that this Orange Coolant (Subaru Part Number 99086) should be used for all initial fills and subsequent replacements to uphold the vehicle's warranty and cooling efficiency. The bottle should state that it meets or exceeds Subaru Standard Specification (WSS) M9823.
More About What coolant does subaru use
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