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This whole conversation is why I just did what Wes says, and ran the cheap, green coolant. It won't last as long, but it's safe. I bought gallon jugs of Fleetguard DCA4 here: https://shop.moderngroup.com/dca70l-chemicals-dca4-liq/ Yes, it was annoying to have to wait for it in the mail but I...

Crap, I missed that. Well, a full flush with new hoses and belts is coming anyway.

Ah! That's a great help, thanks.

Hmmm...check this out: https://www.amazon.com/Miles-Evercool-Concentrated-Antifreeze-Gallon/dp/B00YUL3N72#feature-bullets-btf Green, does not say anything about "extended life", comes precharged with SCA, but you do have to add water. EDIT: Nope, I was wrong. It does say "extended life" but...

Sigh...although I can't find any evidence that the Peak Fleetcharge I used is ELC, I think I'm going to drain and replace it with green coolant and manually add the SCA.

I found a Peak coolant that is not ELC but is also pre-charged with SCA. It's not green, it's pink but their own website says that the color is only for identification purposes. The jug doesn't say "ELC" on it like other products I've seen. This is what I used...

I went through the same hyperventilation about this stuff when I bought my truck. It's true, you don't know if the military bothered testing the coolant and keeping up with the diesel coolant additive that is supposed to prevent cavitation. Might be a ticking time bomb, might not. Probably...