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Has anyone sent in a sample to Blackstone yet? I'm looking to get one done when I do a preventative oil change before she's put away this winter (~4800 mi on the clock). Also getting different answers from dealers about price of service (from standard $80 oil change to the "delux M $250" oil change) and what oil they'd put in the car. Seems like some haven't done any changes on the M2 and that's making me more nervous than just doing it myself...
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