The only thing I've read of concern is that the fancier coolants tend to be designed for all ally/plastic systems and contain OAT (Organic Acid Technology), apparently this can attack the solder in copper/brass rads so probably best to stear clear of that. I just use bog standard Halfords stuff..

Aww heck!

I'll just use water with a little squirrel guts squeezed in it for flavor:lmao: