Antifreeze for Honda
Honda is one of the strictest manufacturers about coolant choice. The owner's manual states outright that blue Type 2 must not be mixed with green Type 1, pink, orange or yellow “universal” coolant. Zerex Asian Blue is exactly what Honda asks for: a blue, silicate-free, phosphated HOAT. Honda and Acura are named on the manufacturer's data sheet.
Photographs come from the manufacturer's official materials.
Why phosphate matters to Honda
The Japanese approach protects aluminium with phosphate, while the European approach, the G12 and G13 types, is phosphate-free and relies on silicate instead. The advantage of phosphate is that it forms a protective film on aluminium very quickly. That matters when an engine goes from cold start to operating temperature within a few minutes.
This is exactly why the European coolant that is easiest to find in Georgia is the wrong choice for a Honda. It simply works on a different principle.
Hybrids and the separate inverter circuit
Honda hybrids, namely the Insight, Fit Hybrid, Vezel, Accord Hybrid and CR-V Hybrid, have two independent cooling systems. One serves the engine, the other the inverter and power control unit. Each has its own reservoir, and Honda specifies blue Type 2 fluid for both.
The passages in an inverter cooler are far narrower than those in an engine radiator. Any deposit, whether silicate gel or hard-water scale, impedes heat transfer there, and an overheating inverter will first derate and then shut down. Replacing an inverter is one of the most expensive hybrid repairs there is.
Zerex Asian Blue is silicate-free at under 10 ppm silicon, carries a phosphate package that works against scale, and is hard-water compatible. All three properties work in favour of those narrow passages.
Two strict rules for a Honda
Rule one: dilute before filling. Honda states explicitly that neither straight antifreeze nor plain water should be poured into the system. Our product is a concentrate, so mix it 50/50 in a separate container and only then fill.
Rule two: do not mix. Honda's manual lists the prohibitions directly: green Type 1, pink Toyota and Subaru, orange Dex-Cool, yellow universal. Mixing causes the inhibitor packages to neutralise each other and sludge to form.
Honda directs owners to have the inverter circuit serviced by a dealer, because it has its own bleeding procedure. Buy the fluid from us and leave the job to a professional.