 Keep your rig running right year-round with Howe's Diesel Defender. It provides maximum lubricity to protect your entire system and contains specialized IDX4 detergent to clean and prevent deposits. It safely removes harmful water and guarantees a 5% increase in fuel economy or more. Diesel Defender is now available at your local O'Reilly Auto Parts store. You can also grab a bottle at truck stops nationwide or have it delivered when you shop the Howe store on Amazon. Defend your diesel with Howe's.