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Different additives, you can see that is a 5 year coolant. At least it isn't dex, but there is a ton of stuff out there that coolants don't mix, and considering the cost of failures, I'd just opt for a flush if I were you. Use distilled water, then I think you only need two gallons Mopar as it mixes 50/50 with distilled. A lot went into the new Chrysler coolant, search the forum for coolant and read the links. The links explain some of the difference between Oats, at least dex and Chrsler Oat.