Subaru Legacy / Outback, BW, BT (USA / CAN)

Additional Notes

• The Subaru Legacy / Outback 2.5i cooling system holds 9 liters, while the 2.4T holds 8.7 liters, a difference of 0.3 liters that reflects the distinct engine architectures between the naturally aspirated flat-four and the turbocharged variant.
• Both engine variants share an identical coolant check interval of 30,000 miles or 30 months, regardless of engine displacement or model year.
• Under normal use conditions, both the 2.4T and 2.5i specify a coolant change at 75,000 miles or 72 months, which equals a six-year service cycle based on time.
• The first change only condition extends the initial coolant drain interval significantly, reaching 137,500 miles or 132 months — the equivalent of 11 years — before the standard recurring 75,000-mile or 72-month cycle takes over for subsequent changes.
• The extended first-change interval of 137,500 miles or 132 months applies to both the 2.4T and 2.5i across the 2019-2022 model year range, indicating a factory-fill coolant formulation rated for longer initial service life than the replacement fluid.
• Capacity figures of 8.7 liters for the 2.4T and 9 liters for the 2.5i represent full cooling system fills, meaning the total volume circulating through the engine, radiator, heater core, and associated passages rather than a partial top-off quantity.
• The 2022-start entries for both the 2.4T and 2.5i carry identical capacity and interval specifications to the 2019-2022 entries, with 8.7 liters and 9 liters respectively and the same check, normal change, and first-change-only intervals unchanged.