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Audi is following BMW in introducing a mechanism to prevent misfueling of diesel vehicles with gasoline. It's generally not possible to put diesel into a gasoline vehicle because the larger diesel nozzles won't fit in the filler neck. However, the smaller gas nozzles will fit in the diesel neck. Audi's system, like the one used by BMW, adds a flap in the neck to prevent fuel flow. The flap only opens up if the nozzle presses on contact points just below the cap. The smaller gasoline nozzle won't