The present invention provides a compressor comprising a housing including a main housing body having an interior reservoir for receiving an oil supply and an upright cover fixedly attached to the main body. The cover has an oil discharge opening extending through a lower portion thereof. The lowest surface defines the oil discharge opening being disposed at substantially the same level as a bottom surface defining the reservoir. The highest surface defines the oil discharge opening being above the normal static free surface level of the oil within the reservoir. A removable plug in the oil discharge opening which when removed allows oil in the reservoir to flow outwardly of the oil discharge opening. The cover has an upwardly facing oil flow engaging and configuring surface extending from the opening for defining the discharge flow configuration of oil flowing out of the opening when the plug is removed. The present invention also provides a compressor wherein the cover includes an exterior upwardly opening funnel shaped structure in an upper portion thereof having an oil filling opening leading from a lower end of the funnel shaped structure. A removable plug in the oil filling opening is configured and positioned to be manually removed to allow the oil filling opening to communicate with the reservoir. It is preferable to provide a compressor wherein the cover includes both the oil flow engaging and configuring surface extending from oil discharge opening and the exterior upwardly opening funnel shaped structure preceding the oil filling opening. Both these designs incorporated into the cover will facilitate a clean changing of oil.