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I would always prefer the BMW trained techs, since they actually get updates. Mercury may for you to go outside of a BMW dealer which is a roll of the dice. IMO
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2013 535i Space Grey, Biege, M-SPort, Premium, Tech, Cold Weather, Luxury Seating, PDC, 6MT ED-10/11/2012 - PCD Redelivery-12/14/12
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