Abstract: A motor-compressor unit comprising a compressor including a rotatable crankshaft, a motor, a shell enclosing the compressor and the motor, a supply of lubricant, and a lubrication system for circulating lubricant through the compressor. The lubrication system includes a first stage axial passage, a second stage axial passage extending upward from an upper portion of the first stage axial passage, a first stage radial passage extending outward from the first stage axial passage, and a second stage radial passage extending outward from the second stage axial passage. The lubrication system further comprises an interstage collection chamber for receiving lubricant directed through the first stage radial passage, and an interstage conduit for conducting lubricant from the interstage collection chamber into the second stage axial passage.