How many movies have Oliver Engelhardt and Oliver Schulze-Hergel collaborated on?

They have worked on 4 movies together! Their first movie together was Ich schenk dir meinen Mann 2 (2001) while their highest rated movie together was Wie buchstabiert man Liebe? (2001). They have not worked together since Claras Schatz (2003). They are most known for their comedy films together.