How AdBlue® turns
toxic exhaust into clean air.
Inside every BS6 and BS4 diesel vehicle sits a Selective Catalytic Reduction (SCR) system. MetaBlue AdBlue® is the fluid that makes it work — dosed into the hot exhaust stream to break down nitrogen oxides into the same nitrogen and water vapour that already make up the air we breathe.
From combustion to clean air.
A closer look at every step inside the SCR system.
The engine produces exhaust that contains nitrogen oxides (NOx).
A small, precise dose of AdBlue® is sprayed into the hot exhaust gas stream.
Heat breaks AdBlue® down into ammonia (NH₃) and carbon dioxide (CO₂).
Ammonia reacts with NOx over the catalyst surface.
Harmful NOx is converted into nitrogen (N₂) and water vapour (H₂O) — natural parts of the air.
of NOx emissions are removed when AdBlue® works inside the SCR catalyst — turning toxic exhaust into harmless nitrogen and water vapour.
The Diesel Particulate Filter (DPF).
The exhaust after-treatment system of a BSVI vehicle uses a filter called the Diesel Particulate Filter (DPF). As the name suggests, the DPF's job is to trap the particulate matter from the exhaust gases.
Like any filter, the DPF must be cleaned as per your vehicle's service manual at regular intervals so it can continue to perform its function effectively — working hand-in-hand with the SCR system and AdBlue®.
Keep it pure, keep it working.
AdBlue® is sensitive to contamination. A few simple practices protect both the fluid and your SCR system.
Never refill used DEF containers. Only fill and dispense with equipment kept exclusively for AdBlue®.
Keep DEF away from fuel, oil, water, dust, dirt and metals — even small amounts can damage the catalyst.
Store between −11°C and +30°C, out of direct sunlight. Sealed, it keeps an ideal shelf life of around 12 months.