DEF Guard Additive Anti-Crystallizer Cleans and prevents crystal formation in the SCR System: Product Description: MotorPower Care DEF Guard Additive, Cleans and prevents crystal formation in (AdBlue) Urea dosing systems and SCR catalytic converters. Prevents performance loss, engine malfunction, and costly repairs. One 250ml dosing bottle treats 100L (26.42 US Gallons) of DEF Urea fluid (AdBlue). Use 25 ml for each 10L (10.5 US Quart)or(2.64 US Gallons) of DEF Urea fluid (AdBlue). Do not overdose! Directions: For all diesel engines equipped with a DEF (AdBlue) system. To use, measure the necessary amount into the bottle's dosing chamber, then mix it with the Urea (AdBlue) solution before adding it to the vehicle's DEF (AdBlue) tank. This process should be repeated at each refill. Note: In systems where Urea injection is supported by air pressure, increased foaming may occur. Do not add to the diesel fuel tank! Benefits: - Cleans and prevents crystal formation in Urea (AdBlue) metering systems, SCR catalytic converters and Urea (AdBlue) injectors. - Protects the Urea (AdBlue) metering systems and SCR catalytic converters and ensures long-term reliability. - Prevents SCR clogging and increases SCR lifetime. - Works both curatively and preventively. - Non-hazardous, non-corrosive, non-irritant.