I've been flushing, adding coolant filter, and refill with Delo ELC, to the International vt365/Powerstroke 6.0 diesels for a decade now in the battle against silicate drop out and casting sand. The Ford Gold coolant was crapola, what kind of red koolaid are they using now? What's the consensus on flush and filter for these guys if the water pump is at risk?
OP, hope you don't mind me jumping in your thread.