How many movies have Gunter Otto and Willi Montana collaborated on?

They have worked on 5 movies together! Their first movie together was Josefine Mutzenbacher...wie sie heute wär V (1983) while their highest rated movie together was Heidi 3: In der Heidi ist es doch am schönsten (1990). They have not worked together since Heidi 2: Im Wald und auf der Heidi (1990). They are most known for their comedy films together.