I stopped by my local MB dealer to ask about the coolant color issue. Told him that I had a XF with blue coolant. The guy in the parts department said that's the way the XF's and MB's come from the factory, with blue coolant. The gallon jugs that they have are all orange; that's the way they come (not blue) and that it's ok to mix the factory blue with the new orange. I asked him how much a gallon was and he said expensive. He looked it up and said $35 a gallon and that I would be better off buying a gallon from my Chrysler dealer ($18).