Gene,
I also updated to the Cat ELC coolant years ago, I was concerned with comments about the hoses failing over the back of the motor, so I installed high temp covers over the hoses.
I have been using the Cat 435-5142 coolant filter, which I change yearly at the same time as I change the oil & filter. This one is a filter, not a blank. Really helps keep the coolant clean.
I send in Oil & Coolant samples for testing each time. My local Cat dealer has test sample kits, with a shipping label, a bottle, and a hose to help with the sample, all ready to go for $20.00 each and that includes the Lab work.
It's a good deal!
Good luck, and safe travels.