What color is typically associated with diesel exhaust fluid (DEF)?

The color blue is typically associated with diesel exhaust fluid (DEF). This fluid is a crucial component in reducing nitrogen oxide emissions in diesel engines, acting as a non-toxic solution composed of urea and deionized water. The blue color helps differentiate DEF from other fluids, particularly engine oils and antifreeze, which may be different colors. This color coding aids in preventing cross-contamination and promotes proper handling and usage in automotive applications. Understanding this association is important for ensuring compliance with emissions regulations and maintaining vehicle efficiency.