UNIVERZAL DEF is a consumable component of SCR equipped diesel engines. SCR allows the engine manufacturer to tune the engine for increased fuel efficiency while remaining in compliance with Federal emissions requirements. It is a nontoxic solution, stable, colorless and odorless. It will work with ALL Selective Catalytic Reduction (SCR)-equipped diesel engines. Compatible with AdBlue® & other DEF products. Meet the ISO 22241 guidelines.