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Message: <blockquote data-quote="wc9922" data-source="post: 322176" data-attributes="member: 6000">Gerald,I think you will find your 530i will respond to V-power better due to it's ECU's capabilities to adapt to fuel quality. But you got to let the DME adapt to it first maybe after 20-30 mins of driving as it will adjust your short term fuel trim and timing. Vise versa when u go from V-power to the normal grade fuel. Clearing adaptation values would enable the dme to relearn your trim values faster. For those guys driving big cc performance cars like a Porsche/Ferrari/AMG/Brabus/M or with force induction, they can tell the diff cause the power difference is significantlynoticable on their rides if they change the fuel grade due to the way the engine is designed from the start.</blockquote>