What type of antifreeze does my 2015 Jeep Grand Cherokee use?

The 2015 Jeep Grand Cherokee is recommended to take an OAT coolant, as this is what it comes with from the manufacturer. If You want to stick with an OEM solution, You can find a compatible Mopar coolant that is purple in color. If You're searching for a part number, You'll find it as Mopar 68163849AA. With that said, Your '15 Grand Cherokee isn't particularly picky when it comes to antifreeze, so You can use just about anything from a reputable brand. The most important thing is that You don't mix different coolant types, though; doing so can result in some pretty nasty reactions. If You're not sure what's in the system now, it's best to do a total drain and fill.