No idea why. But Nulon themselves say that it is a hybrid coolant using a mixture of IAT and OAT. The IAT component is the one with silicates and WILL cause abrasion and pitting in the Honda cooling system and eventually causes pinholes and leaks.
Even Nulon themselves say to use the red coolant for aluminium radiators. http://www.nulon.com.au/products/Red...rated_Coolant/



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