I am changing the filter and fluid in the pan. Fluid was a little less pink and a hint of tan when on the paper towel. I will put a pan on with a drain plug so I can easily change it from now on. It uses ATF+4 fluid. Is there a synthetic version that can be used in this, or will it make no difference. I have 83,000 miles, and supposedly an auxiliary cooler within this AC/Condensor. Not sure how Jeep makes it work, but apparently all Jeep Libertys that had towing packages got it, but all 2012's got it.