What kind of coolant does a brz take?
The BRZ uses a HOAT (Hybrid Organic Acid Technology) ethylene glycol–based long-life coolant, best supplied as the OEM long-life coolant (Subaru Genuine Long Life Coolant or Toyota Genuine Long Life Coolant) in a premixed 50/50 formulation.
Originating from a joint Subaru-Toyota project, the BRZ’s cooling system is designed to work with HOAT coolants that are compatible with both brands. It is essential to use the correct type to prevent corrosion and overheating, and to follow proper mixing and flushing procedures when replacing coolant.
Coolant type and compatibility
The BRZ’s cooling system requires a coolant that is ethylene glycol-based and formulated as HOAT. This means you should use either OEM long-life coolant from Subaru or Toyota, or a reputable aftermarket HOAT coolant that explicitly lists compatibility with Toyota/Subaru engines. Avoid non-HOAT formulas such as standard “green” old-style coolant without HOAT, and avoid Dex-Cool (GM orange) or other non-HOAT products unless the manufacturer confirms compatibility.
Approved coolant options
Below are common, compatible choices BRZ owners use. Always verify with your owner's manual or dealer if in doubt.
- Subaru Genuine Long Life Coolant ( Subar u-approved HOAT ethylene glycol–based coolant)
- Toyota Genuine Long Life Coolant (Toyota-approved HOAT ethylene glycol–based coolant)
- Any reputable HOAT coolant that explicitly lists compatibility with Toyota and Subaru engines on the label
In practice, sticking with OEM coolant is the simplest path, and ensure it’s premixed 50/50. Do not mix different coolant families or colors. When in doubt, consult a dealer or a qualified technician.
Maintenance and service tips
To keep the BRZ cooling system in good shape, follow these steps. Note that you should consult your manual for model-specific instructions and capacities.
- Ensure the engine is completely cool before opening the cooling system. Place a container beneath the drain plug and drain the old coolant.
- Optionally flush the system with distilled water or a manufacturer-recommended flush, then drain again.
- Reinstall the drain plug and fill with the correct 50/50 premixed HOAT coolant to the proper level.
- Bleed the cooling system to remove air pockets: start the engine with the radiator cap off (or per manual) and top up until the air is purged and the level stabilizes.
- Check for leaks, verify that the coolant reservoir level remains within the recommended range, and ensure proper operation of the thermostat and radiator fans.
- Dispose of any old coolant responsibly and never mix used coolant with new coolant from a different batch.
Regularly servicing the cooling system with OEM or HOAT-compatible coolant helps prevent overheating and corrosion over the BRZ’s lifespan.
Summary
For the Toyota/Subaru BRZ, the recommended coolant is a HOAT ethylene glycol–based long-life coolant. Use Subaru Genuine Long Life Coolant or Toyota Genuine Long Life Coolant, or a reputable HOAT coolant clearly labeled as compatible with Toyota/Subaru engines, in premixed 50/50 form. Avoid Dex-Cool and non-HOAT formulas unless explicitly approved. Always follow the owner's manual for capacities and bleeding procedures, and dispose of old coolant responsibly.
