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I own a shell station so maybe i can help clarify the new nitrogen cleaning agent...you won't notice hardly anything...it's a cleaning agent to help slowly remove "gunk"..more like a long term protection.
I just filled up with it yesterday... I don't think there is supposed to be any sort of "difference" that you can feel... but more like a long-term protection that as was stated previously... To me, it's just gas... We really won't every know if the stuff works or not... we just have to take them for their word.
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.