My mechanic at our local CAT dealer did the switch to RED a year ago. I bought a gallon of RED coolant (Delo) from BCS to have on hand. I've filled the overflow tank using the Delo Red, no issues. I don't know if the CAT dealer used CAT RED or Delo. Correct me if I'm wrong, but I think RED is RED and all should meet the CAT RED spec. (I'm guessing here!)