AdBlue is an aqueous urea solution that is used in vehicles with Selective Catalytic Reduction (SCR) technology to reduce nitrogen oxides (NOx). It is injected into the exhaust gas stream and helps to convert harmful nitrogen oxides into nitrogen and water.

Hydraulic oil, on the other hand, is a special lubricant used in hydraulic systems to enable smooth operation and efficient power transmission. It transfers pressure to fluid and ensures the movement and control of components such as cylinders, valves and pumps in hydraulic machines and equipment.