I use it and recommend it to all my customers.
The benefits are:
less visible smoke, my tailgate stays quite clean despite I don't wash my van every week
regular usage should improve the fuel economy (depends how you drive though)
longer lasting injectors and whole fuel system
better performance from the engine for longer
Cleaner intake system (from less emission less crud is going through the EGR into the intake)
As I mentioned, I also recommend using BG244J every 5,000km (I always use it when I service your vehicle) - expensive but well worth it, believe me.
Oh, and just for the reference, VW now recommends using the fuel additives.
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