Hi all I’ve just fitted an aly rad to my 97 +8 and have been doing a bit of research on coolant / antifreeze and I’m none the wiser so advice would be appreciated, do I go for ready mixed OAT ( organic ) or silicate based , concentrate with distilled water or tap water ? It just strikes me as odd that the engine is aluminium block and silicate based was recommended in one manual then a site I visited said organic for aluminium rads is best or am I just being to over cautious after spending a few quid on a new rad ?
