hi guys,does anyone no the capcity of the radiator+engineblock+heater,im going to change my coolant and need to try and work out how much i need,im probably going to run 50%coolant 50% water,any thoughts on this ratio and or which type of coolant is better.is using de mineralised water a good idea or just another expense,and do you recomend a radiator flush type product first.you thoughts please cheers pete