Parts for your 2018 Subaru Xv-Coolant

2018 Subaru XV Coolant — What It Does and How to Look After It

Coolant is absolutely relevant and used on the 2018 Subaru XV. The model’s 2.0L FB-series boxer engine is liquid-cooled, and Subaru specifies a long‑life ethylene‑glycol coolant. Technical references including the 2018 Subaru XV/Crosstrek Owner’s Manual and Subaru’s Technical Information System (STIS) call for Subaru Super Coolant (blue), a premixed, extended‑life formulation designed for aluminium engines.

In this XV, coolant pulls heat out of the engine, protects against boiling in summer and freezing in alpine winters, and carries corrosion inhibitors that keep the radiator, heater core and water pump in good nick. It also helps lubricate the water pump seal, reducing wear and pesky leaks. That blue colour isn’t just for show—Subaru’s phosphate organic acid technology (P‑OAT) package is tuned for their alloy components and seals, so using the right spec really matters.

For servicing in Australia and New Zealand, the factory fill is a long‑life coolant with an extended change interval. Many markets list an initial replacement at around the 10–11 year/200,000+ km mark, then roughly every 5–6 years/100,000–120,000 km thereafter. Always follow the interval in the local Owner’s Manual or dealer service schedule, as specs can vary by market and build.

Day to day, it’s simple: check the translucent overflow tank under the bonnet when the engine is cold. The level should sit between the “Low” and “Full” marks. If a top‑up is needed, use Subaru Super Coolant (blue) premix. Avoid mixing types or colours, if you must top up in a pinch, a very small amount of demineralised water is acceptable, but restore the correct premix as soon as possible.

• Watch for clues the system needs attention: rising temp gauge, a sweet smell, white or pink crust around hose joints, or coolant that’s brown, sludgy or oily.
• At change time, have a proper drain, refill and bleed performed so air pockets don’t form—heater on hot, system burped, and levels rechecked cold the next day.
• Inspect hoses, clamps and the radiator cap, replace anything perished, and recycle used coolant responsibly.

If the XV ever overheats, pull over safely, switch off, and let it cool completely before checking. For precise coolant specification, capacity and intervals for your VIN, the Owner’s Manual and Subaru dealer information remain the authoritative sources.

Popular questions about 2018 Subaru XV coolant

What coolant type and colour does a 2018 Subaru XV use?
The 2018 XV uses Subaru Super Coolant (blue), a premixed long‑life ethylene‑glycol coolant with corrosion inhibitors suitable for aluminium engines. It’s a P‑OAT formulation specified by Subaru in technical literature and the Owner’s Manual.

How often should the coolant be changed?
The factory fill is long‑life, typically around 10–11 years/200,000+ km before the first change, then roughly every 5–6 years/100,000–120,000 km. Always follow the interval listed in the local Owner’s Manual or dealer schedule for your market.

Can different coolant colours be mixed?
Best not. Mixing the blue Subaru coolant with green or “universal” coolants can dilute inhibitor chemistry and reduce protection. If a temporary top‑up is unavoidable, use a small amount of demineralised water only, then correct with the proper Subaru blue premix.