Have to be a bit careful, since model years can also include some previoius year builds. In the W201, cars built after December 85 have the jumping mono wiper with the dual nozzle hood, however there are many 85 models that were built in late 84 that aren't so equiped.

The 84 M102 engine had solid lifters and lower compression pistons while the 85 and on M102 had they self adjusting hydraulic lifters.