Can vehicle urea be used after being stored for two years?

[LeRuby]

Vehicle urea that has been stored for two years cannot be used. Additional information: Vehicle urea is a pure but relatively unstable chemical compound. The following four points should be noted during storage: 1. Storage temperature requirements: Vehicle urea requires a storage temperature of approximately -5 to 25°C to avoid exposure to light and high temperatures. In summer, the urea solution should be cooled. If a strong ammonia odor is detected when opening the container lid, usage should be discontinued. Urea will crystallize at low temperatures, expanding in volume by about 7%, so do not fill the urea solution to full capacity—maintain it at around 90% of the container's volume. 2. Vehicle urea has a shelf life: It is recommended to use factory products within six months. For products stored over a year, strong recommendation is to avoid usage. 3. Special storage containers and filling equipment are required: Urea reacts chemically with metals such as copper, iron, and aluminum. Prolonged exposure to these metals can degrade the urea quality, subsequently affecting the SCR system's performance. Special filling equipment must be used when refilling the vehicle with urea.