It kills me that the MB's of this era had no lock-up converter and no overdrive. Those two things would definitely have been worth a few MPG's particularly on the highway. American cars of the 80's costing 1/3 as much had both of those features.

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86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm