I've been on Comma's website and it states it is ethylene glycol based with silicate inhibitors, it is all I have been putting in redblocks for about a year now and so far no issues at all.
I used to use castrol radicool but it is quite expensive when the comma G48 does the job just fine.
I'd just use the G48 or the super cold master if I were you, no point spending big money on it as it should be changed roughly every 2-3 years anyway.
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