Blue Def Platinum, 2.5 Gal., with advanced system sheild technology, it is a mixture of high purity synthetic urea, deionized water and our proprietary additive. Package manufacturerd under ISO 2241 guildlines to ensure product quality, with continual use. BlueDEF Platnium reduces the formation of deposits that build up in your diesel exhaust system, API registered and meets or exceeds OEM specifications.