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Message: [QUOTE="Strictly Diesel, post: 305464, member: 1411"] Not sure I would agree. Not sure what you are meaning specifically by "HD", but if you're talking about the stuff used in OTR trucks, those products were developed for different circumstances. Lets say that the CAT coolant people like to talk about was developed for 150,000 mile replacement and use in an OTR truck. How does it's use in a 6.0L differ from it's use in an OTR truck? 1. How long does it take (in time) for an OTR truck to go 150k miles compared to an "average" 6.0L pickup truck? 2. During that time, which one will be heat cycled more times (shut down and fully cooled off to fully warmed up and back to cool again) and what does the heat cycling do to the coolant? 3. Which one is more likely to be exposed to combustion gasses (considering the good old 4-bolt per cylinder configuration of the 6.0L and the fact that most other engines are 6-bolt per cylinder)? There's really nothing wrong with the gold coolant, IF it is properly maintained. The problem is that Ford didn't publish realistic maintenance intervals and service recommendations (pH checking, additives, etc). This is happening with many vehicles from EVERY manufacturer and it's all being done to drive down the "perceived" cost of ownership. If they can say "you don't need to touch xyz for 100k miles", that costs less than saying "check coolant pH every oil change ($0.30 test strip) and use additive as necessary (also cheap)...flush and replace coolant when test strip shows depleted glycol level". If they can say "this truck costs $0.15 per mile to own and our competitor costs $0.18 per mile to own"...they will and they'll use it to sell you the truck. It's total BS...what the hell happens to the cost of ownership when you add in a trip to the shop for EGR and Oil coolers? Problem is, they were gambling that the trucks would make it to the 100k mile warranty or that they would get to void warranties for "modifications" to get out of covering the costs...which stuck a bunch of people with stiff repair bills. It's NOT the fault of the gold coolant...it's the penny pinchers and marketing people being involved in parts of the process they shouldn't be! [/QUOTE]