Abstract: A prelubricating system for an internal combustion engine includes an oil intake dimensioned for insertion into the dipstick well of the engine. The oil intake tube is connected to an inlet side of an electric pump. An outlet side of the pump is connected to the oil pressure sender coupling aperture on the engine block for supplying oil to internal oil passages. A pressure activated switch causes actuation of the electric oil pump when the engine ignition switches is activated. When a predetermined oil pressure is achieved, the electric pump is deactuated and the engine starter motor solenoid is energized. In a second embodiment, the system includes an electric oil heater and a thermostatic control for preventing starting of the engine until a predetermined oil pressure and temperature has been reached. The oil intake tube includes a quick release coupling and a graduated scale for measuring the quantity of oil in the sump.