After doing my research online from the various articles posted by vehicle media it appears that there are two different colors of coolant available. Some of the pictures show an orange coolant, but my truck has purple coolant. Is the orange coolant part of the heavy duty coolant and the purple the the maximum duty coolant? I have the tow package on mine and thought that would be the reasoning between the two different listings on the build sheets. Can anyone confirm or deny this thought?