Many modern trucks, like diesel passenger vehicles, use ad-blue for emissions reduction. Of course, a truck will use much more than a car, so many major truck stops provide a bowser so drivers can refill their ad-blue tank. The ad-blue bowsers I have seen are a bit smaller than those for petrol/diesel, and they have a thin bright-blue nozzle.
I seem to recall that last time I looked, ad-blue was cheaper per-litre than diesel. It is mostly water after all!



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