Mercedes-Benz Classic at Techno Classica 2017: Sportiness "brand gene" meets service expertise - Mercedes-Benz Group Media - Back to the future – ahead of its time: Mercedes-Benz 540 K Streamliner (W 29), 1938. Built as a one-off model in the special vehicle production unit of the Mercedes-Benz Sindelfingen plant. Following its restoration and reconstruction to the original condition, the car is brought back into the public eye by Mercedes-Benz Classic in mid-2014. The measurement in the wind tunnel in Stuttgart-Untertürkheim in May 2014 delivers a sensational drag coefficient of Cd = 0.36.