2.5 Gallon, BlueDEF Platinum with Advanced System Shield Technology. Premium Diesel Exhaust Fluid with a proprietary formula to tackle deposits that can build up in the SCR system. Through continual use, reduces future deposits that build up in your diesel exhaust system. These deposits create back pressure which can increase fuel consumption and reduce engine power. Once residue collects, it cannot be removed and over time can lead to the costly replacement of your SCR system. Features & Benefits: Maintains optimum fuel economy, Saves money on costly repairs, Sustains the life of your SCR system, Compatible with all diesel SCR systems, Tested to meet or exceed the strictest OEM standards, Conforms to the ISO-22241-1 specification for DEF, and is an American Petroleum Institute (API) certified diesel exhaust fluid.