Subaru Impreza, GE, GH (EU)

Additional Notes

• The Subaru Impreza GE/GH (EU) 2.0 D carries the largest cooling system capacity across all listed variants at 8.8 liters, compared to the 6.8–7.6 liter range seen in the petrol variants.
• The 1.5R and 2.0R variants built before model year 2009 carry a simpler coolant change interval of 30,000 km or 24 months, with no separate check interval listed. From model year 2009 onward, both variants adopt a structured schedule that separates periodic checks at 30,000 km/24 months from full coolant changes at 120,000 km/72 months under normal use conditions.
• The 1.5R capacity is specified as a range of 7.4–7.6 liters, and the 2.0R as 6.8–7.3 liters. A capacity range rather than a fixed value typically reflects minor variation between assembly tolerances or cooling circuit configurations within the same engine family.
• Under initial service conditions for model year 2009 onward, the coolant change interval extends to 220,000 km or 132 months across the 1.5R, 1.5R FWD, 2.0R, 2.0 D, and 2.5T WRX variants. This extended interval reflects the use of long-life coolant from the factory fill, which degrades more slowly than a standard replacement fluid.
• The Impreza 2.5T WRX specifies two distinct capacities depending on transmission type: 6.8 liters with a manual gearbox and 6.7 liters with an automatic transmission. The 0.1-liter difference likely corresponds to minor variation in coolant routing near the transmission oil cooler circuit.
• The Impreza 1.5R FWD (2008-2012) shares the same 7.4–7.6 liter capacity and the same 120,000 km/72-month change interval under normal conditions as the all-wheel-drive 1.5R from model year 2009 onward, indicating the drivetrain configuration does not affect cooling system volume or service scheduling for this engine.
• The 2.5T WRX STI (2007-2011) has a cooling system capacity of 7.7 liters, which is higher than the standard 2.5T WRX at 6.7–6.8 liters. The STI variant uses a more heavily cooled engine setup, and the larger coolant volume is consistent with the additional thermal management demands of a higher-output turbocharged application.
• The 2.5T WRX STI is the only variant in the dataset that carries the extended check and change schedule from the start of the listed production range without a separate pre-2009 entry. Both the normal use change interval of 120,000 km/72 months and the initial service interval of 220,000 km/132 months apply across the full 2007-2011 span.