Sure Flow Plus is a long-life coolant based on organic acid technology (O.A.T.) This organic acid technology coolant provides a number of advantages over traditionally used cooling system corrosion inhibitor formulations. Automotive:current ratings up to 240,000km. Diesel: current ratings up to almost 1,000,000km. Low depletion rates on inhibitors. Superior localised corrosion inhibition. Superior high temperature corrosion protection. Excellent heat transfer characteristics. Buffered to pH 7.5 to 8.