How much urea consumption per 100 kilometers is normal?
2 Answers
Urea consumption is calculated at 5%~7% of fuel consumption. For example, a heavy-duty truck with 20L/100km fuel consumption will consume approximately 1L of urea per 100 kilometers. In traffic congestion, urea consumption may be slightly lower. Below is more information about automotive urea: Definition: Automotive urea, also known as diesel exhaust fluid (DEF), is a liquid used in SCR (Selective Catalytic Reduction) technology to reduce nitrogen oxide (NOx) emissions from diesel vehicles. Its composition consists of 32.5% high-purity urea and 67.5% deionized water. Reason for adding urea to diesel engines: During operation, diesel engines emit harmful nitrogen oxide compounds that damage both the atmosphere and human health. Prolonged exposure to these gases can cause respiratory diseases. To mitigate these hazards, when urea encounters nitrogen oxides emitted by diesel engines, a chemical reaction occurs, converting the nitrogen oxides into harmless nitrogen gas and water vapor for emission.
I've been driving heavy trucks for long-distance haulage for eight years, and I know all about the urea consumption. For standard-load tractors running on flat terrain, burning 3-5 liters per 100 kilometers is normal. When climbing mountains in Yunnan, Guizhou, or Sichuan, it can shoot up to 6-8 liters, and I've even seen 10 liters when rushing to deliver fresh produce. New China VI engines consume more urea than China V ones because the aftertreatment system is more sensitive. Consumption is lower in winter and higher in summer, and don’t fill the tank too full to avoid crystallization. The key is to check if the exhaust pipe emits white smoke—if it burns clean, you're good. Don’t let repair shops trick you into changing the nozzle; first, check if the urea level warning light is on. My Auman has run 500,000 kilometers, and its urea usage has been very stable.
