Rislone has released a new DEF Crystal Clean Diesel DEF & SCR Emissions System Cleaner, which the company says scrubs away crystal contaminants from the selective catalytic reduction (SCR) systems of diesel vehicles to restore power and performance. The company adds that keeping the system clean can help prevent new crystals from forming, and improve the life of emissions components.

Rislone says diesel exhaust fluid (DEF) can break down and evaporate, leaving behind white crystal deposits, which can build up and clog SCR system components. This can cause the vehicle to operate in what Rislone calls “limp mode,” where it drives slowly or not at all. According to Rislone, diesel vehicles that are regularly driven at low speeds, with light loads, for short durations, or that make frequent stops are especially prone to developing white crystal deposits in their SCR systems.

“In Europe and other parts of the world where many passenger vehicles run on diesel fuel, SCR maintenance is more familiar and routine than in North America,” says Clay Parks, Rislone vice president of development. “But many diesel vehicles here have reached an age where SCR malfunctions are increasingly plaguing owners. We dedicated years of research to develop an effective solution to help our customers avoid costly SCR repair bills.”

Rislone tells us its new DEF Crystal Clean uses a blend of cleaning agents and surfactant detergents to safely dissolve crystal deposits throughout the SCR system, including the tank, pump, heater, sender, lines, injector, decomposition tube/reactor and mixer. The company adds that it can restores SCR function while clearing P20EE and other related OBD codes.

Rislone says DEF Crystal Clean will not void manufacturers’ new vehicle warranties, adding that it works with all UREA DEF/ AdBlue fluids in vehicles with DOC catalytic converters, DPF particulate filters, SCR devices, ASC ammonia slip catalyst and DEF/AdBlue systems.