Diesel mystery from an '81 catalog...

Picked up a piece of nicely-illustrated dealer literature for the '81 diesels recently. It contained an interesting piece of data: that Mercedes diesels had some kind of gizmo (my term) which would adjust them appropriatly to suit the altitude at which they were operating.

Anybody else ever hear about or see this nugget?

It would be of interest to owners in Denver and other high-up places were it true.