You probably won't find any information for anything but R134a in automotive use, it's the standard since 1992 or 1993, and no automotive system uses R12 or anything else from the factory. Not system newer than then will have any recommendation for mineral oil
Ester oils were the magic ones that you could add to an R12 system to make the oil compatible with R134a. I suspect all PAG (poly alkylene glycol) oils are too polar for anything but fluorocarbon refrigerants. Don't have any documentation though, just basic chemistry. _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
