Starting Fluid can help extended the life of the battery in your 2004.5-2005 Chevy/GMC 6.6L LLY Duramax. Whether you have a diesel or gasoline engine, this product is safe to use in outboard motors, generators, lawn care equipment, and automobile applications. The product will perform to -65 degrees Fahrenheit and is safe for most engines as it contains an upper cylinder lubricant. Get the fluids and additive that you need for your vehicle rom top brands like Lucas Oil at XDP.