My head is about to explode. We're in the process of replacing some of our coolant hoses and putting in two valves in the hoses that lead to the hot water heater. In the process we are flushing out the coolant system. We don't know how long the current coolant has been in our coach. This is being done by a repair facility that we have used for a couple years and they seem to be pretty good at what they do. They are recommending GL5 Universal Long Life coolant, 5 year, 100,000 mile. They say they have been using this in everything they service which includes lots of motorhomes and large trucks. In reading this thread many of you are saying to stay away from GO5 extended life coolants. I can't find much online about GL5 but I do see GO5. Are they the same thing or is our repair shop mixed up? Supposedly the GL5 is a glucol based coolant. I don't know what else is in it. I'd like to get this worked out once and for all before it's time to put new coolant in.

Sorry, but right now I just don't get it and don't want to do something stupid to the coach.

Thanks everyone.