ESOC's Series 850 Portable Oil Changer specially fills the need of fast, environmentally safe and clean oil changes on transport refrigeration units. The Series 850 connects to the engine's drain pan via a spill-free, low-profile drain fitting, and evacuates the engine's waste oil, transferring it to an approved waste container. During the process, the mechanic can manually draw an oil sample for later analysis. The system can introduce clean, fresh oil as well.