That whole stupid crap of having the extra tank for the sulfur reduction chemical. It kinda bit VW in the ass since they used programming to make their stuff US qualified. European models don't have them and Germany won't allow that setup. (or vice versa) can't remember exactly.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course