I don't get it. Engines in so many different cars/trucks are made of the same metals but there are what seems to be endless different antifreeze formulas. Shops don't seem to care nearly as much as the internet. What is the difference between a Ford with Aluminum, cast iron and plastic components than a BMW or Mercedes or Toyota.... If we are mixing with distilled water it should make Zero difference, right? From what I can tell they blend the coolant due to the local water supply or so it seems.