Originally Posted by
AndrewWV
I'm pretty sure that gold stuff is a HOAT (hybrid) extended life coolant, not that I really know what that means in practical terms, beyond what I've read around the web. I do know the subject of coolants is another online holy war of sorts.
Andrew, you're exactly right, it's a H-OAT coolant.
What that means is this: the Ford "gold"/Zerex G-05 Hybrid Organic Acid Technology coolant still contains silicates. Silicate drop out is what causes problems with the 6.0 coolant passages in the oil cooler, and it also eats the water pump seals. That's why Late '99 and up 7.3L PSD owners that had conventional "green" coolant will flush and fill with an OAT ELC, because the "green" has a lot more silicates than the "gold"
You can read more here, where I have a ton more info listed in this thread:
Gooch's Coolant Flush Procedure and In-Depth Coolant Information - FTE
Stewart