Quote Originally Posted by markismaximus View Post
why would nulon green be suitable for these other car manufacturers (who I could probably guarantee have aluminum blocks, heads, etc) but not for aluminum Honda engines. the aluminum they use is probably the same
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/