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Black Forest Gwinnett - 770-466-7602 - Service of Mercedes Benz, BMW & Lexus. Serving Gwinnett County Mercedes Benz, BMW & Lexus Owners since 1982. Black Forest in Gwinnett County, GA is your trusted Service Center for all maintenance and auto repairs on your Mercedes Benz, BMW & Lexus Automobiles. We're located at 640 Highway 78 (Athens Hwy) in Loganville, GA 30052. Serving Loganville, Snellville, Lawrenceville, Grayson, Gwinnett County, Walton County.