Just wondering what coolant you guys run in the 5 litre windsors
I,ve got a 500ml bottle of ford corrosion inhibitor , code is R13C just wondering if its the right one car is a 2000 au xls ute

Tectaloy 90 is what i've been using

i use .... industrial Deminralised water from work never over heats even in middle of summer when it reaches 55'c in the sun although when doing stand stills it can get close to boiling if you dont get moving and some air flowing after a few min...

Been advised by Engine builder and radiator specialist that the only glycol based coolant to use is Genuine Toyota coolant, the pink stuff. Supposedly Tectaloy is shocking stuff for corrosion etc, especially of aluminium.
That is what i'll be running in mine. 50/50 mix with Distilled water and a bottle of redline water wetter.