It's been a while since our spy photographers caught the BMW M3 Sedan in action. A black prototype was previously spied lapping the Nurburgring
and now a test mule has been spotted in white undergoing an essential winter examination. The change of color indicates the fifth-gen M3 is further into development and a reveal in concept form at March's Geneva Motor Show is a distinct possibility. A small rear spoiler is now evident as are carbon ceramic brakes complete with six-piston calipers at the front axle.