Parts for your 2013 Subaru Impreza-Coolant

2013 Subaru Impreza coolant – what it does and how to look after it

Coolant absolutely is used on the 2013 Subaru Impreza. The model’s FB20 2.0‑litre boxer engine is liquid‑cooled, as detailed in the 2013 Subaru Impreza Owner’s Manual and the FB20 Engine Service Manual available via Subaru’s technical information system. Subaru specifies its long‑life blue Subaru Super Coolant (pre‑mixed 50/50) for this car.

In this Impreza, coolant has three core jobs: carry heat away from the engine, protect internal passages from corrosion, and raise the boiling point/ lower the freezing point so the car copes with Aussie heat and Kiwi winters alike. The system uses a pressurised surge tank high on the engine, a thermostat, water pump and radiator to keep temperatures stable, which helps performance, economy and gasket life.

For servicing, Subaru’s long‑life blue coolant typically has an extended first replacement interval (often up to 11 years/220,000 km) and then shorter intervals after that. Always check the vehicle’s service book or local Subaru schedule, as intervals can vary by market and usage. If the history’s unknown, a baseline coolant change is a smart move.

• Use the right stuff: Subaru Super Coolant (blue), or an equivalent P‑OAT formula that meets Subaru specs. Don’t mix green or “universal” coolants, as that shortens service life.
• Topping up: Use the same blue pre‑mix. Avoid plain water unless it’s an emergency, then replace with the correct coolant ASAP.
• Checks between services: Look for the correct level in the overflow tank when the engine’s cold, clean bright blue colour (not rusty/brown), and no sweet smell, wet spots, or white crust around hoses or the cap.
• Bleeding after service: On the FB20, fill via the surge tank, set the heater to HOT, and run the engine to purge air. Trapped air can cause hot spots and poor cabin heat.
• Hardware matters: Ageing radiator caps, swollen hoses, or a sticky thermostat can undo fresh coolant—replace if suspect.

Drivers who keep the coolant fresh, stick to the correct spec, and fix leaks early generally enjoy stable temperatures and fewer dramas over high mileage.

Popular questions

What coolant type does a 2013 Subaru Impreza use?
Subaru specifies its blue long‑life Subaru Super Coolant, supplied as a 50/50 pre‑mix. If an equivalent is used, it should be a phosphate‑OAT formula that meets Subaru’s requirements. Mixing types can reduce protection and service life.

How often should the coolant be changed?
With Subaru’s blue long‑life coolant, the first change is typically extended (often up to 11 years/220,000 km), then subsequent changes are shorter. Always confirm with the owner’s manual or local Subaru schedule, and service sooner if the colour’s off or contamination is seen.

What are signs the Impreza needs coolant attention?
Low level in the overflow tank, brown or cloudy coolant, temperature fluctuations, weak cabin heat, or dried white residue around hose joints or the cap. A sweet smell after shutdown can also point to a small leak. Address issues early to protect the head gaskets and radiator.