lubricants were judged to be miscible in all tested proportions over the entire temperature range except that for the hfo 1225ye mixtures with polyalkylene glycol the refrigerant mixture was found to be immiscible over the temperature range of u2212 50 u00b0 c to u2212 30 u00b0 c and to be partially miscible over from u2212 20 to 50 u00b0 c at 50 weight percent concentration of the pag in refrigerant and at 60 u00b0 the refrigerant pag mixture was miscible at 70 u00b0 c it was miscible from 5 weight percent lubricant in refrigerant to 50 weight percent lubricant in refrigerant the compatibility of the refrigerant compounds and compositions of the present invention with pag lubricating oils while in contact with metals used in refrigeration and air conditioning systems is tested at 350 u00b0 c representing conditions much more severe than are found in many refrigeration and air conditioning applications aluminum copper and steel coupons are added to heavy walled glass tubes two grams of oil are added to the tubes the tubes are then evacuated and one gram of refrigerant is added the tubes are put into an oven at 350 u00b0 f for one week and visual observations are made at the end of the exposure period the tubes are removed this procedure was done for the following combinations of oil and the compound of the present invention a hfo 1234ze and gm goodwrench pag oil b hfo1243 zf and gm goodwrench oil pag oil c hfo 1234ze and mopar.