Under certain conditions, the water in DEF can evaporate, leaving behind white crystal urea deposits. Over time, these crystals can build up, clogging system components and interfering with normal ...

HOLLY, Mich., April 16, 2025 (GLOBE NEWSWIRE) -- A diesel truck, car or SUV that is losing power and fuel economy, shutting down unexpectedly, and/or has a DEF warning light illuminated is probably ...