I am glad you have had good luck with yours and are happy with it. I can see that the POs (no pun intended) of these two didn't change the oil often enough, but matters are in hand to correct that.
If M-B wants to have a reputation for quality, they need to actually build quality. Quality is not only "remembered long after the price is forgotten", it confers on a piece of machinery a degree of immunity to neglect or abuse. The minds at M-B seem to be increasingly of the view that the customer is a peon who must do exactly as told in order to have any sort of moral claim on the company. Sadly, they don't keep up their end of the bargain: failing circuit boards are not due to the actions of the owner, but the defective design, methods or materials of the manufacturer. The moral contract, or more precisely, the pure corporate self-interest of M-B, would dictate that they fix without charge what they failed to do properly in the first place. If someone is to be penalized let it be the designer or the supplier as appropriate.
In the past most German businesses seemed to have a good understanding of the fundamentals of customer service and reputation; a better one than most companies in the Anglosphere I believe. The cultural devotion to quality and workmanship is well known, though often saddled with an unfortunate fascination for complexity, which more recently seems to have morphed into a fascination with qualitative corner-cutting. Arrogance without substance is a recipe for disaster. As elsewhere in the world, it seems more recent generations are increasingly out of touch with such realities.
So the current corporate leadership is bent on squeezing profits out of the former reputation of the company? What they seem not to realize is that their reputation was founded on quality more than style. Take away the quality and what is left? How long will the corporate image survive? One customer at a time they are eroding and degrading that reputation, and seem to have forgotten that word travels faster and wider now than at any time in history. This is a silent death of a thousand cuts, their reputation is bleeding away and everything goes with it. Once it reaches the tipping point where that three pointed star has acquired a different meaning in the minds of potential buyers - what then? It will be too late to correct not matter what is done. This is what bean-counters fail to realize, or simply choose to ignore.
In North America where corporate governance is in the hands of stock market speculators everything is sacrificed to short term profits. Executives have likewise become greedy short-term thinkers mostly intent on profiting as much as they can personally before moving on to some other victim. If that mentality and behaviour has infected Germany they are done. The war-time and post-war generations understood this.
Toyota has built their success on quality, and good design. Take away the quality and there is nothing left. The resale value of M-B and BMW products even in the Japanese market where owners take better care of their vehicles is puny, often no more than 10% of new price. That is not true of most Japanese built vehicles, here or there.
There, I have got that off my chest! 😄