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Coolant The 2008 Impreza WRX STi and all 2009 MY vehicles are factory-filled with the new Subaru Super Coolant. This new coolant is blue in color and has an extended life of 10 years before servicing is required. It is OK to mix Subaru Super Coolant with Subaru Long Life Coolant, but if you do so, use the original 30K mile replacement interval.