A refrigerant service system comprising: a compressor having a compressor inlet and a compressor outlet; an inlet conduit; an outlet conduit; and an accumulator (138. 300) including an outer housing shell (180, 312) and an inner housing shell (192, 324) disposed within the outer housing shell (180, 312), wherein a first chamber (184, 316) is defined in the accumulator (138, 300) between the inner housing shell (192, 324) and the outer housing shell (180, 312), the first chamber (184, 3 16) being configured to receive refrigerant from the inlet conduit and discharge the refrigerant to the compressor inlet, wherein a second chamber (196, 328) is defined in the accumulator (138, 300) separate from the first chamber (184, 316) within the inner housing shell (192, 324), the second chamber (196, 328) being configured to receive the refrigerant from the compressor outlet and discharge the refrigerant to the outlet conduit, and wherein the first and second chambers (184, 196, 316, 328) are arranged such that heat is transferred from the refrigerant in the second chamber (196, 328) through the inner housing shell (192, 324) to the refrigerant in the first chamber (184, 316), characterized in that a compressor oil outlet passage is defined in the inner housing shell (192, 324) having a first end that opens to the second chamber (196, 328) and a second end that connects to an compressor oil return line, the compressor oil return line connecting the compressor oil outlet passage to an oil return port of the compressor and being configured to return compressor oil removed from the refrigerant in the second chamber (196, 328) to the compressor. a compressor having a compressor inlet and a compressor outlet; an inlet conduit; an outlet conduit; and an accumulator (138. 300) including an outer housing shell (180, 312) and an inner housing shell (192, 324) disposed within the outer housing shell (180, 312), wherein a first chamber (184, 316) is defined in the accumulator (138, 300) between the inner housing shell (192, 324) and the outer housing shell (180, 312), the first chamber (184, 3 16) being configured to receive refrigerant from the inlet conduit and discharge the refrigerant to the compressor inlet, wherein a second chamber (196, 328) is defined in the accumulator (138, 300) separate from the first chamber (184, 316) within the inner housing shell (192, 324), the second chamber (196, 328) being configured to receive the refrigerant from the compressor outlet and discharge the refrigerant to the outlet conduit, and wherein the first and second chambers (184, 196, 316, 328) are arranged such that heat is transferred from the refrigerant in the second chamber (196, 328) through the inner housing shell (192, 324) to the refrigerant in the first chamber (184, 316), characterized in that a compressor oil outlet passage is defined in the inner housing shell (192, 324) having a first end that opens to the second chamber (196, 328) and a second end that connects to an compressor oil return line, the compressor oil return line connecting the compressor oil outlet passage to an oil return port of the compressor and being configured to return compressor oil removed from the refrigerant in the second chamber (196, 328) to the compressor.