Ive been doing alot of reading and im getting confused/concerned. Alot of people are saying NOT to mix different types of antifreeze, but they dont say why. Like i say i have been using cheap (£1 a bottle) antifreeze, and then adding water when it was neccesary, not often, just a bit here and there... so is me adding red antifreeze to this mix a bad idea? is it useless?? or am i even running a chance of damaging something??? Thankyou.