I am on my third engine and my 4th radiator all due to the sludge. Now it is sludged up again and running hot intermittantly. I use prestone super flush and replace the thermostat twice a year. I have heard all about the early dexcool issue which is supposed to be fixed now. It seems that the radiator flush products you can purchase are for rust and scale; nothing seems to clean this sludge which is like Georgia red clay or almost a rubber coating inside the radiator and all through the coolant system.
What I need to know is what will clean this stuff?
