Luverly!

Stuttgart's finest sure came with some fine looking hardware under their bonnets - link below is a pic of the straight six under the hood of my old S-Class. Amusingly, the 280SE I've got is really the baby of the then range, since the bigger engines were mostly V-8s!
However I'm already finding this one more economical than previous S-Classes I've owned, which is a plus obviously.

Merc 2.8 straight six