3: Thoroughly clean the filter housing cap.Replace two provided O-rings. For Cadillac 3.0L L5P Duramax. For Chevy 3.0L / 6.6L L5P Duramax. For GMC 3.0L / 6.6L L5P Duramax. Shields Fuel Injectors & High-Pressure Common Rail System from Wear — Extends Engine Lifespan.
