Parts for your 2020 Subaru Impreza-Coolant

2020 Subaru Impreza Coolant — What It Does and How to Look After It

Coolant absolutely is relevant to the 2020 Subaru Impreza. According to the Subaru Owner’s Manual for MY2020 Impreza and the Subaru Service Manual for the FB20 engine, this model runs a pressurised liquid cooling system that uses Subaru Super Coolant (blue), a long‑life, pre‑mixed antifreeze/coolant formulated for aluminium engines. Subaru’s published maintenance schedules (AU/NZ) specify extended coolant life and replacement timing for this vehicle.

For this Impreza, coolant’s job is straightforward: carry heat away from the engine, keep operating temps steady, prevent freezing and boil‑over, and guard the radiator, water pump, and alloy passages against corrosion. The right coolant means the FB20 runs sweet, even on hot Aussie and Kiwi summer days or crisp South Island mornings.

Subaru specifies its blue Super Coolant (phosphate OAT‑type), and it should not be mixed with green or universal brews. Sticking with the correct type keeps the long‑life additives doing their thing and avoids gunk, scale, or premature component wear.

Service intervals are generous with the factory fill: typically up to 11 years/220,000 km for the initial fill, then every 6 years/100,000 km thereafter (check the exact interval in the owner’s handbook for local spec). Even with long‑life coolant, quick checks are worth it between services.

• Check the translucent reservoir level when the engine’s cold, top up only with the same Subaru blue coolant. If using concentrate, mix with demineralised water.
• Look for signs of trouble: sweet smell, white/blue crust around hoses or the water pump, discoloured fluid, rising temps under load, or low heater performance.
• At change time, use the proper bleed procedure: heater set to hot, run the engine to operating temp, let fans cycle, and purge air so there are no hot spots.
• Inspect hoses, clamps, the radiator cap, and the thermostat during any coolant service.
• Dispose of old coolant safely—pets are attracted to it and it’s toxic.

Keeping the 2020 Impreza on the correct blue Subaru Super Coolant and following the long‑life change schedule lets the FB20 stay cool, efficient, and happy for the long haul.

Popular questions about 2020 Subaru Impreza coolant

What coolant does a 2020 Subaru Impreza use?
The 2020 Impreza is designed for Subaru Super Coolant (blue), a long‑life pre‑mixed antifreeze/coolant suitable for aluminium engines. Using the specified Subaru blue formula maintains corrosion protection and the extended service interval. Avoid mixing with green or “universal” types, as this can shorten coolant life and reduce protection.

How often should the coolant be changed?
For most AU/NZ models, the factory fill can last up to 11 years/220,000 km, then 6 years/100,000 km for subsequent changes. Always confirm the exact interval in the owner’s handbook for the specific trim and market. Regular level checks and hose inspections should still happen at routine services.

Can distilled water be used to top up?
If the level is slightly low and the exact Subaru blue coolant isn’t on hand, a small top‑up with demineralised/distilled water is acceptable. However, it’s best to top up with the correct Subaru blue pre‑mix to maintain the 50/50 ratio and additive balance. If more than a small amount is needed, use the proper coolant.