I had major work done to my 1966 Mustang powertrain; Basically engine rebuild, new radiator, heater core, hoses, etc. The shop filled it with a Dexcool OAT Havoline orange colored coolant when I asked for the IAT older type green. Why did I want the older IAT type? Well I had heard and read a lot of bad things about Dexcool and all OAT coolants in systems not designed for them, and I figured that the safest bet would be the old-style green the car was engineered for. So now what do you all recommend? 1. Just stick with the Dexcool and don't worry about it? 2. Flush it out as best as I can and go with green and take a chance that not all of Dexcool is out of the system? Take a risk that it would congeal into jello? 3. Take a middle of the road approach and put in a HOAT coolant which seems to be compatible with both the green IAT and the OAT/Dexcool coolants if not all of it is flushed out? Minimize the risk of congealing but maybe not eliminate it?
The car is driven sparingly. To shows, Cars & Coffees, on nice weekends and it is stored over the winter (December through March)
The car is driven sparingly. To shows, Cars & Coffees, on nice weekends and it is stored over the winter (December through March)