You've discovered the reason that I chose NOT to switch over to ELC. I don't want to use a product that will be so difficult to find in an emergency, say while traveling, and a heater hose blow. Or whatever reason.

Seems to me that a long life coolant like the Ford Gold or the Zerex G05 would already be a good step up from the green juice that your 7.3 was spec'd for.

JMO of course. I went with the Zerex at my last flush.