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What is Tata Motors DEF (Diesel Exhaust Fluid)?

DEF (Diesel Exhaust Fluid), often marketed as AdBlue, is a clear, non-toxic fluid used in BS6 diesel vehicles equipped with SCR (Selective Catalytic Reduction) systems.

🔍 Key Details

Purpose: DEF reduces harmful nitrogen oxide (NOx) emissions from diesel engines, turning them into safe nitrogen and water vapor. It helps diesel vehicles comply with strict emission norms (BS6/Euro 6).

Composition: It’s typically a 32.5% high-purity urea solution mixed with 67.5% deionized water.

How it works: The vehicle’s exhaust passes through the SCR system where DEF is injected. The fluid decomposes into ammonia, which reacts with NOx to create harmless nitrogen and water.


📌 Key Concepts:
✔ Not fuel or engine oil — DEF is stored in a separate tank.
✔ Helps reduce NOx emissions, making diesel exhaust cleaner.
✔ Essential for BS6 compliance on vehicles like Tata buses, trucks, and SUVs.
✔ Made of urea and water — safe, non-toxic, and non-flammable.
✔ Dashboard alerts tell you when to refill.