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Congrats on the awesome M6!
Sounds like you're taking great care of it. Getting a full service and coolant flush at an independent shop is a smart move, especially given the unknown service history.
Spark plug changes are usually recommended every 30-40k miles, so changing them every year might be a bit excessive. You can check your owner's manual for specific recommendations.
The "Competition" part is confusing. It's possible the VIN identifies it as a Competition model even if it doesn't have the badges. Checking with a BMW dealership or specialist might clear things up.
Looking forward to seeing some pictures when the weather cooperates!
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