I've now read Redline's technical document http://www.redlineoil.com/whitePaper/17.pdf and things become much clearer - perhaps I should have done so before commenting  .
Basically, the large temperature reductions claimed are due to running the cooling system on pure water and water wetter. This is not too surprising as pure water has a higher thermal capacity than a water/antifreeze mix.
I'd recommend anybody to read this document before trying it.
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I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely in your thoughts advanced to the state of Science, whatever the matter may be.
Sir William Thomson
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