I am amazed by the level of attention to details of those MB engineenr. I came across this paragraph while reading the press material on
http://www.worldcarfans.com/news.cfm...class-revealed
"
Ventilating rear lights: patented system replacing a spoiler
With the help of digital aerodynamic prototypes and tests in the wind tunnel, specialists in Sindelfingen came up with individual, intelligent solutions which measurably reduce the air resistance of the vehicle body. These include innovative "ventilating rear lights" – a system patented by Mercedes-Benz which replaces conventional spoiler lips and therefore does not compromise the attractive lines of the Saloon. The system works as follows: both rear lights of the new C-Class feature several small air vents. Air is sucked in from the underbody and flows behind the rear lights, which are sealed against the body, in the area between the rear cross-member and the rear bumper. The air is conducted to the air vents in the lights, where it flows out and influences the airstream along the side walls.
As a result the airstream along the sides is abruptly redirected at the rear lights, eliminating turbulences which would otherwise negatively influence the air resistance, rear axle lift and yaw characteristics of the Saloon."
It is hard to see them in the photos, but i used paint to point them out.
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