[77newell]

Power Cool is a Detroit Diesel brand name. If you look in the DD website for fluid specifications you will find a document that tells you what specifications are needed to be met by other brands. Power Cool is unique in color (purple) but meets a common specification (RCP-329 if memory serves me right, which is a big IF) for diesel engines. But you need to check the DD booklet and the various coolants against each other. As I recall, there wasn't a big difference in price.