Much as it might be tempting, I cannot claim sole authorship. I think the original was from a link posted by either Cubes or Mark in another thread about G40 coolant. That set me on a research journey of my own that uncovered a couple of extra snippets. Thinking the same as yourself, I created my own spread sheet to hold the info. (Spread sheets and databases far more complex than this used to be my daily bread and butter). Recently updated a tad further with info from the link in #13. The innovation I can claim as my own is the attempt to match the actual coolant colours with header colours in the spread sheet and the colour indication which mixtures result in brown coolant. Not 100% accurate but may help? (Isaac Newton quote: "If I have seen further than most, it is only by standing on the shoulders of giants!"). Like working with electrical fittings, it would not help to be colour blind when working with the complexities of engine coolants?Also thanks to Flintstone for the comprehensive coolant table. I've printed it off for safe keeping.