Coolants can be divided into 3 types.
- 1. Conventional
2. OAT (Organic Acid Technology)
3. Hybrid (also called HOAT)
OAT & Hybrid are long life coolants.
Conventional and OAT cannot be mixed.
Hybrid can be mixed with either of the others.
The color is determined by what dye the manufacturer uses. It will not tell you what type of coolant it is. I use a Hybrid coolant which is green. Conventional coolant is sometimes green, sometimes yellow. OAT coolant can be any color.
In regard to cavitation issues with some diesels, check to see if the coolant is manufactured to ASTM D6210-10. This standard (which was developed by John Deere engines) ensures the coolant has the cavitation protection required.