Anyone have a preference of which ELC to use and/or which ELC to not use? Thanks in advance for your comments.

 

My opinion is just a quality brand and check the label for the CAT-1 rating in the specifications. You’ll be good ta go. Having said that I tried to keep the CAT brand coolant in mine but my nearest dealer is a half hour away and they sometimes didn’t have the concentrate, just the pre-mix. My local Tractor Supply keeps a CAT-1 rated coolant on the shelf so I’ve been using that. (don’t recall the brand right this minute and I’m at work).

 

Back when I owned a 6.0 POS, I used International Fleetrite...
https://www.fleetrite.com/parts/flui...c5050g-coolant

 

This is what have used in my truck for the 40k+ miles. I got it from Tractor Supply.

 

That’s the stuff.

 

It's the same in Germany, I always have to pre-order the concentrate.