Rotary screw Bitzer BSE 55 Kaltemaschinenol Refrigeration Compressor Oil, Grade: A Grade, Packaging Type: Tin. Oils for HFC and HFO refrigerants BITZER compressors which are intended for use with chlorine-free HFC and HFO refrigerants (R134a, R404A, R407A/C/F, R507A, R1234yf, R513A, R450A etc.)