What is Diesel Exhaust Fluid (DEF)? What is its use for vehicles?

[BentleyRose]

Diesel Exhaust Fluid (DEF) is an essential product for heavy-duty diesel vehicles to meet China's National IV emission standards. Below are relevant explanations: 1. Definition: DEF refers to an aqueous urea solution with a urea concentration of 32.5% and solvent being ultrapure water. The raw materials consist of specialized urea for vehicle use and purified water. 2. Function: To reduce nitrogen oxide emissions. It can be directly added to the vehicle's DEF tank or filled through a dispensing machine. Generally, filling up to 80% of the DEF tank capacity is sufficient. Using this product can effectively reduce nitrogen oxides and particulate matter in exhaust emissions, decrease air pollution from acidic gases, and improve air quality.