Roman Goldberg considers himself well-versed in classic BMWs, and understandably so. In his garage, you’ll find a stunning example of a Dakar Yellow E36 M3, and an E12 528i. Parked between them? This gorgeous M635CSi, one of just 5,859 BMW Motorsport-developed 6ers built for a worldwide audience. That tidbit, though, was part of a lesson learned by Roman after discovering the car in an online classified ad.