Why does Ford require testing for their OAT about every 14K?Cummins has a (OAT) Lifetime coolant that is designed for Diesel engines, you put it in and never need to change it again.
I talked with our filtration/coolant group and this will work great in our Kubota tractors and it never needs to be replaced and you can replace the Dexcool coolant in your GM trucks with it.
https://www.cumminsfiltration.com/organicacidtechnology