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The 2005 Subaru Legacy recommends using the popular zerexBlue 50/50 coolant in its tank. This coolant, available in one-gallon containers, can be bought at various retail stores, online, or automotive parts shops. Prices range from $6 to $53 per container. You will need around 7 containers for a full coolant change in the Legacy, as it can hold up to 8 to 10 gallons. The 50/50 mixture of water and antifreeze in this coolant helps prevent engine damage and overheating, ensuring optimal performance.
Peak OET Antifreeze/Engine Coolant PAG0B3 is a recommended choice for the 2005 Subaru Legacy.