Don't mix Orange and Purple Mopar antifreeze
My friend picked up a new 2013 Redline Rally Challenger recently and we noticed it had purple antifreeze from the factory. Another friend saw this antifreeze and wanted to see if his pre-2013 Plum Crazy R/T could use it - since it's purple. From the Mopar service center it appears the 2 different HOAT and OAT antifreeze mixtures are not mixable. Be sure to drain and flush orange HOAT prior to installing OAT purple.
Jeep Grand Cherokee WK2 - Maintenance information and schedules
Chrysler Corporation LLC. has released a new engine coolant for 2013 model year vehicles and beyond.
Mopar Antifreeze/Coolant 10-year/150,000 mile formula
p/n 68163848AA (concentrate) / p/n 68163849AA (50/50 mixture)
MSRP $53.35/gallon (concentrate) / MSRP $33.35/gallon (50/50 mixture)
The use of aluminum cylinder blocks, cylinder heads, and water pumps requires special corrosion protection. Mopar® Antifreeze/Coolant, or the equivalent ethylene-glycol base coolant with organic corrosion inhibitors (called OAT, for Organic Additive Technology) is recommended. This coolant offers the best engine cooling without corrosion when mixed with 50% ethylene-glycol and 50% distilled water to obtain a freeze point of -37°C (-35°F). If it loses color or becomes contaminated, drain, flush, and replace with fresh properly mixed coolant solution.
OAT coolant is purple in color. It cannot be mixed with other types of coolant including Chrysler's existing HOAT coolant and only should only be mixed with approved OAT coolant of the same color. Maintenance of the cooling system is not required unless a repair has been made with loss of coolant or the coolant has been contaminated.