Parts for your 2009 Subaru Exiga-Coolant

2009 Subaru Exiga Coolant — What It Does and How to Look After It

Coolant is absolutely relevant and used in the 2009 Subaru Exiga. Technical sources including the 2009 Subaru Exiga owner’s manual and Subaru’s Technical Service Bulletin 09-36-10R (which introduced Subaru Super Coolant) confirm the vehicle runs a liquid-cooled Subaru boxer engine that relies on engine coolant/antifreeze to manage temperature and corrosion control. Subaru Genuine “Super Coolant” (blue, long-life, premixed) is the specified fluid in this era.

For this model, coolant isn’t just about keeping things cool on a hot summer’s day. It raises the boiling point, lowers the freezing point, and protects internal passages, the water pump, heater core and radiator from corrosion and scale. That means stable temps, a happy head gasket and a heater that actually blows warm air in winter.

Subaru’s Super Coolant is a long-life, blue PHOAT-type premix designed for extended service intervals. As outlined in Subaru literature and the above TSB, the factory fill typically runs up to around 11 years/220,000 km, with subsequent changes generally at shorter intervals. If the system has ever been topped with non-blue or non-Subaru coolant, expect the interval to shorten significantly. When in doubt, follow the owner’s manual schedule that applies to local conditions in Australia or New Zealand.

Smart owners treat coolant as a regular service item. Under the bonnet, check the translucent overflow tank level when the engine’s cold. If it’s low, only top with the correct Subaru Super Coolant premix—don’t dilute with water or mix colours. Any rusty tint, oily sheen or repeated top-ups signal it’s time for a pressure test and a proper drain-and-fill with a system bleed to clear air pockets.

• Inspect hoses, clamps and the radiator cap during every service, replace if perished or weak.
• Keep the radiator fins free of bugs and debris for better airflow.
• After any cooling-system work, verify the cabin heater runs hot and the temp gauge stays steady.

Workshop tip: bleeding a Subaru boxer’s cooling system is easier with the nose slightly elevated and the heater on full hot. Use a proper funnel, let the thermostat cycle, and watch for a steady stream with no bubbles at the filler. Sticking with the right coolant and intervals pays off with quieter pumps, stable temps and long engine life.

Popular questions about 2009 Subaru Exiga coolant

What coolant type should a 2009 Subaru Exiga use?
Subaru specifies its Genuine Subaru Super Coolant (blue, premixed). It’s a long-life formulation compatible with Subaru alloys and seals. If an equivalent is used, it must meet the same long-life PHOAT-style spec and be premixed to 50/50. Avoid mixing colours or brands, as that can cut service life and protection.

How often should the coolant be changed?
For vehicles filled with Subaru Super Coolant from new, Subaru documentation allows an extended first interval (often up to about 11 years/220,000 km), then shorter intervals thereafter. Service timing can vary with climate and prior mixing history, so follow the owner’s manual and the vehicle’s service records.

Can they top up with water in a pinch?
If absolutely necessary, a very small top-up with clean water will get the car home, but it’s better to use the correct premix. Water dilutes corrosion inhibitors and freeze/boil protection. After any water top-up, have the mix checked and corrected as soon as possible.