Give the engine in your 2004.5-2005 Chevy/GMC 6.6L LLY Duramax the stabilizing, stiction eliminating, performance, or zinc break-in Oil Additives it needs. Decrease friction and heat to help extend the service life of your engine oil. Restores lost compression and horsepower while cleaning and protecting components within the engine. Shop for premium brands of additives at XDP, including Lucas Oil, Hot Shot's Secret, Rev-X, XDP, and Hamilton Cams.