Abstract: For an engine to be operated under oil pressure, an oil refiner composed of a cylindrical housing having a lid and a heater means arranged in the upper portion of the housing and a plurality of radially extending fins adapted to be heated by said heater means and a plate and filter means in the housing to filter oil traveling through the device and to heat it and wherein the device includes a one-way check valve means so that oil is always present in the device for quick response upon ignition of the vehicle.