This might be considered a diesel commercial if you count the 300SD, SDL, and 350SD and SDL, but I remember seeing a commercial when I was little (the early 90's) with a yellow W126 racing down a test track with crash test dummies inside, exhibiting the safety of the S-class.
-Joe

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.