Someone has probably shared this already, but just in case.
https://www.youtube.com/c/MercedesBenzW116/videos
I just found this video series, starring Herve! I'm not sure how useful they will be, particularly to some of the gurus here, but there are one or two of us mortals who could always learn something. Plus, it's great when anyone is taking an interest in, and talking about a W116. There also seems to be 3 language options, so you can brush up on your foreign language skills, while also learning how to open an stuck bonnet (Hood)!
I actually like the subject car too, being a very basic, manual transmission 280S. There is a certain charm and honesty about a car with absolutely no options!