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Last updated: September 2025
AdBlue (DEF) confusion mostly stems from how SCR works; it is not a fuel additive, never enters the engine, and—used correctly—cuts NOx without harming performance [3][4][1][2].
Disclaimer: Always follow the owner’s manual and ISO 22241 requirements; never dilute or add anything to the DEF tank, and use only compatible materials and clean equipment [5][6][7].