Mercedes (US) - M Class - Marketing Academy - The M-Class Takes the High Road (1997)

Video pitching the M Class against its competitors.

there is the following note in the case:

"The ML 320 has two intake ports. When the lower intake port is submerged, the engine gets air from the upper intake port. There is no flap in the air intake system as noted by the instructor on The M-Class Takes The High Road video tape. Please refer to the 1998 model 163 introduction manual for further clarification."