The vehicle came from the factory with Chrysler G-05. That is what should go back in. Chrysler sells it along with Zerex. Use distilled water to dilute. Unless you see crud in the system I would just do a drain and fill of radiator now and in the fall. After that do one drain and fill every other year (or so). With the extended life coolant its not that critical that is be drained and filled on any rigid schedule.