Quote Originally Posted by 1997 View Post
ganyan din yung dati kong Hilander.. ang ginawa ko is I use purified water from water station and replace my water weekly.. sa radiator lang via drain plug.. then after few weeks nagiging clear na yung water.. tapos that's the time na gumamit na ako ng pre mix toyota coolant...
You would have achieved similar results by just doing a proper flush once. Exposing your engine components and radiator to plain water for an extended period, purified or not, causes problems with metal surfaces.