It is no revelation that maximizing equipment life directly impacts the bottom line. When it comes to profitability, every dollar saved on equipment maintenance is a dollar earned. Prelube pumps move oil from the oil sump to the moving parts of an engine before engine start-up. Pre-lubing before every start is an inexpensive way to extend the life of engine-driven equipment. When an engine is running, the engine's oil pump supplies pressurized oil into the center of the bearings to create a cushion that separates the bearing surface from the crankshaft. Once the engine is running, the surfaces never touch because they ride on this film of oil. As soon as the engine shuts down, however, the oil that comprises the cushion begins to drain away and the film thins.