Organic acid (OA) or organic acid technology (OAT) coolants are being aggressively marketed today as a far superior product to more conventional coolants. Claims are being made such as superior performance, as well as a product that is friendly to the environment. Further, some producers of OAT coolants claim that it is the only product in the market that can provide long life as well as extended service intervals. This paper is being written to closely examine and challenge these claims. High quality conventional coolants offer all the advantages claimed for OA coolants and in some cases provide superior performance.