Has anyone used Cam2 ATF4 transmission fluid in any Chrysler Vehicles? I understand it isn't licensed for use by Chrysler but it was used by a mechanic that I used to go to. It seemed to help the vehicles get better gas milage at that time about 25 years ago. The shop had changed hands and they no longer use it. I purchased the lifetime warranty on my current vehicle that was purchased new in 2013 and hesitant to use it so I won't void the warranty. Has anyone been using it recently and what is your experience with it?