Not sure if I posted this in the right forum. but I need some R134a for the 96 sunfire. I was looking around the net and found some websites that sell environmentally friendly drop in replacement. I don't know squat about refrigerant. I was wondering if anyone has any experience with the environmentally friendly replacements. Is it okay to use? I found this on ebay. MACFREEZE REFRIGERANT "Colder than R-12 or 134a"