The thing is that VW decided that it was going to differentiate itself from the likes of Mercedes Benz and BMW, both of which are only able to achieve it by using AdBlue also referred to as DEF (Diesel Exhaust Fluid). They couldn't achieve the emissions targets AND provide good performance and fuel economy. So, they decided to go down this path, which was extremely foolish.
The AdBlue is injected into a catalytic converter where the urea in the presence of a catalyst sees the NOx split into Nitrogen and Oxygen. Yes, it is a hassle, but it is what it is and if you want to play in that sand pit, it means you have to do it.
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