Why do modern trucks need AdBlue?

Environmental issues are high on the agenda of most countries and tight emission norms are changing the way vehicles operate. You can read more about this in the article on our website: ‘Wolf and the evolution of heavy duty engine oil’.

To reduce the level of NOx – one of the harmful gasses regulated by European legislation – the system of Selective Catalytic Reduction (SCR) is installed. All trucks larger than 7.5T produced after 2006 are equipped with it and consequently require the use of AdBlue.

What is AdBlue?

AdBlue is a solution of urea (32.5%) in water (67.5%) and is a registered trademark held by the German Association of the Automobile industry. AdBlue is injected into the exhaust gas stream, where it reacts with NOx to form harmless Nitrogen and water vapor. As an extra advantage, SCR equipped trucks use less fuel thanks to the better engine timing, which is necessary for the SCR system. AdBlue is dosed at a rate equivalent to 3–5% of diesel consumption. For Euro IV vehicles it is close to 4%, for Euro V –  around 6%.

AdBlue is kept in a separate tank in the truck and should never be mixed with diesel fuel. Always keep the solution clean from dirt and dust and be aware that it freezes at -11°C, but is usable after thawing.

How to maintain diesel engines with Selective Catalytic Reduction

SCR technology is popular all over Europe. When properly maintained and lubricated by an adapted low SAPS oil, like for example WOLF OFFICIALTECH10W30 MS or WOLF OFFICIALTECH 10W40 ULTRA MS, the SCR will remain fully operational during the complete lifetime of the truck.

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