The LM302 Level Maintainer automatically adds oil to the crankcase as needed to keep the lube level normal, and will alarm and/or shutdown the equipment if the makeup supply is depleted and engine oil level falls or if overfill conditions exist. The unique design features two switches for low and high level shutdown or alarm. Four wires, DPST, wired N.O. in normal operating ranges. The LM302 can be used with engines, compressors, pumps and coolers.