A-RE21748 Filter, Oil (Engine Bypass)One New Aftermarket Replacement Engine Bypass Oil Filter Fits John Deere Tractors This engine bypass oil filter is a spin on lube filter that provides secondary filtration for the engine lubrication system on Fits John Deere (Fits JD) agricultural tractors. The bypass filter continuously cleans a portion of the engine oil, removing fine contaminants that pass through the primary full flow filter to extend engine life and maintain oil quality between