Last year during the winter I bought some STP dry gas for my wife's VW Passat. Shortly after putting the stuff into the engine I had bucking and stalling problems. I made it to a gas station and put in Premium fuel. It still stalled and bucked for the next 30 miles and I stopped to top off with more premium. After three fillups with premium the check engine light went off and the stalling stopped. No problems since. Moral of story....I'll never ever buy dry gas again. Disclaimer...for engines built after 2001 from Germany! But I'm very hesitant to consider an additive to the fuel of a VX after that experience.
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