Subaru Legacy / Outback, BN, BS (USA / CAN)

Coolant capacity & service interval

Subaru Legacy / Outback, BN, BS (USA / CAN) coolant capacity ranges from 7 to 7,8 liters. Service intervals include checks at 30000 miles or 30 months, and changes at 75000 miles or 72 months and 137500 miles or 132 months. The data covers 10 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
Legacy / Outback 2.5 i (2017-2019)
  • Use: Subsequently
  • Capacity 7,8 liter
  • Check 30000 miles/ 30 months
  • Change 75000 miles/ 72 months
Legacy / Outback 2.5 i (2017-2019)
  • Use: First change only
  • Capacity 7,8 liter
  • Check 30000 miles/ 30 months
  • Change 137500 miles/ 132 months
Legacy / Outback 2.5i (2015-2017)
  • Use: Subsequently
  • Capacity 7,6-7,8 liter
  • Check 30000 miles/ 30 months
  • Change 75000 miles/ 72 months
Legacy / Outback 2.5i (2015-2017)
  • Use: First change only
  • Capacity 7,6-7,8 liter
  • Check 30000 miles/ 30 months
  • Change 137500 miles/ 132 months
Legacy / Outback 3.6R (2015-2019)
  • Use: Subsequently
  • Capacity 7 liter
  • Check 30000 miles/ 30 months
  • Change 75000 miles/ 72 months
Legacy / Outback 3.6R (2015-2019)
  • Use: First change only
  • Capacity 7 liter
  • Check 30000 miles/ 30 months
  • Change 137500 miles/ 132 months
Legacy / Outback 2.5i (2014-2015)
  • Use: Subsequently
  • Capacity 7,6-7,8 liter
  • Check 30000 miles/ 30 months
  • Change 75000 miles/ 72 months
Legacy / Outback 2.5i (2014-2015)
  • Use: First change only
  • Capacity 7,6-7,8 liter
  • Check 30000 miles/ 30 months
  • Change 137500 miles/ 132 months
Legacy / Outback 3.6R (2014-2015)
  • Use: Subsequently
  • Capacity 7 liter
  • Check 30000 miles/ 30 months
  • Change 75000 miles/ 72 months
Legacy / Outback 3.6R (2014-2015)
  • Use: First change only
  • Capacity 7 liter
  • Check 30000 miles/ 30 months
  • Change 137500 miles/ 132 months

Additional Notes

  • The Subaru Legacy / Outback BN/BS cooling system capacity for the 2.5i engine across the 2014-2017 model years is listed as a range of 7.6-7.8 liters, reflecting a small variance that can occur between individual service fills depending on how completely the system is drained and refilled.
  • Starting with the 2017-2019 2.5i, the capacity range narrows to a fixed 7.8 liters, representing the upper bound of what was previously a variable figure for earlier 2.5i configurations.
  • The 3.6R engine carries a cooling system capacity of 7.0 liters across both the 2014-2015 and 2015-2019 entries, which is lower than the 7.6-7.8 liter range of the 2.5i despite the larger displacement of the six-cylinder engine.
  • All configurations share a coolant check interval of every 30,000 miles or 30 months, whichever comes first, applying uniformly regardless of engine type or model year.
  • The first change only interval across all configurations is set at 137,500 miles or 132 months, meaning the initial factory-fill coolant is designed to remain in service for approximately 11 years before the first scheduled replacement.
  • After the first change, all configurations move to a subsequent change interval of 75,000 miles or 72 months, which is roughly half the mileage and time span of the initial fill interval.
  • The gap between the first change only interval of 137,500 miles and the subsequent interval of 75,000 miles reflects a common industry practice where long-life coolant is used at the factory, with standard-life coolant assumed for all refills thereafter.

Other Systems