ya kevin, unfortunatly tech's are at the mercy of the management and what they decided needs to be stocked on the shelves. They usually tend to stock only the coolant that is compatible with the brand of truck they sell. The company i work for happens to stock 2 types, the green and the extended life coolant, anything else we have to get ourselves locally if we need it. It has to do with the inventory system and how we sell parts... if we dont move enough of one thing within a certain time period it gets taken away and as for things such as coolant and oils we are just at the mercy of what they want on the shelf. I think it has something to do with the aftermarket company we deal with, like unisource or promatch, TVH or premier parts, whoever the aftermarket is and what they push to the vendor/dealer. I'm sure there are other reasons i'm not aware of but this is just my take on how it works from my point of view.

And as for raytech's thing about GM's bulletin on mixing dexcool with green? They can say what they want about that but i've seen what happens when you do mix them and personally from my experience i just dont do it because of the extra work it creates having to clean out the mess it creates later on.