Emergency run and slight oil loss

Good evening together, I have an R350cdi from 2011 with 121,000km and since last week the following problem. On the way home from the city in stagnant traffic I suddenly could not really give up and the engine had no power anymore. Came hardly from the spot and the automatic turned up very early, but not down any more, so that I could hardly swim in the traffic, let alone later on the country road. I then on a dirt road, car off, again on. Problem away, was al At the beginning of the week, other problem, automatic switches unclean and powerless, speed goes up before switching into the next gear approx. 300 rpm. Later the problem disappears again. Still 2 times short distance driven (approx. 15km) without problems and completely normal switching. Was 2 days ago to read out for error at my free workshop, result there was no error deposited. I have now researched something here in the forum and am on various possible causes. The right hose and the engine at the front in the middle are visibly oiled (see pictures), otherwise nothing is noticeable. However, I am also a technical layman. Can someone give a remote diagnosis on the basis of my description and the attached pictures or at least exclude something. Should have to return to Kaiserslautern and Sonntag tomorrow, but ask me if this is a good idea under these circumstances. ee is….?? Many thanks and greetings! Lars