I successfully adjusted the valves on my 1975 300D using the kit from MercedesSource (awesome wrenches by the way). Only 2 exhaust and 1 intake needed to be adjusted but engine does run smoother. In addition, my transmission is shifting much smoother, almost too smooth, almost like it is slipping but not quite.
Should this be a concern I don't want to pre-maturely wear out my transmission.