I'm suspicious that Mercedes is intentionally under minding diesel technology to keep gas cars dominant in the automotive industry market for the near future. Refusing to pay Bosch can't just be the only reason for these issues of poor quality infecting Mercedes diesel cars in my opinion.

GM (General Motors) using Delphi manufactured parts (probably) is what helped to give diesel passenger cars a bad rap in the last energy crisis when GM attempted to develop and market a passenger car, diesel engine in the 1980's which ended in catastrophic results and deemed a total failure by history and now Mercedes is using Delphi (the same Delphi of the 1980's) to produce diesel injectors and those Delphi injectors are being blamed for poor quality issues in new diesel engines when the injector is trying to operate at pressures at or approaching 30,000 psi, which is ridiculous to have a requirement such as that, when diesel technology is so simple at its core.

Also, I would bet that the problem is not the injectors at all, but is the injection pump, as the injection pump has always been the source of problems in the past, but everything else but the injection pump has been blamed and scape goated by Mercedes because Mercedes just don't know injection pumps and don't want to pay Bosch which Bosch technology is equivalent or not more so to a diesel engine than the engine designers are to the equation but Mercedes refuse to pay Bosch for what it brings to the table in terms of what makes diesel cars run reliably; I've concluded. It's kind of like asking a thoroughbred horse to win the Kentucky Derby but the thoroughbred has no legs, which Bosch is the legs and Mercedes is the thoroughbred in the passenger car diesel engines game.

The solution to the problem will never be resolved until Mercedes pay Bosch a more than fair share of the profits made or the problems will continue indefinitely, unless Mercedes is intentionally trying to kill off the diesel passenger car industry. A computer is never going to control a diesel engine and not cost more than the car itself, which will bring Mercedes back to the same problem they have now but at a higher cost when they have to pay the computer people as opposed to paying the mechanical people; it appears Mercedes has a problem even with that, paying Bosch.

It is just unfortunate for Delphi to be caught up in the middle in what for Delphi is a lose, lose situation no matter what they do. It is very hard and difficult to reinvent the wheel, which is Delphi's task in making these Mercedes diesels go at 30.000 pounds of pressure per square inch on an injector. The diesel injection pump is the legs that make things go and how can you pump 30,000 psi and be in time and the engine pistons can withstand that pressure at all ranges of engine performance needs by the driver? Anybody can build an engine. But diesel injection is a totally different kind of animal that is hardly understood except for by Bosch. They are truly geniuses over at Bosch in what they do. They can do good or they can do bad and it doesn't make a dime difference to them which it is, bad or good because they can always do D grade work and the car companies will just have to deal with it and keep buying D grade stuff from them, when their A stuff is in the vault waiting to get paid for.

This is what my research company has lead us to believe and mostly know in the context of what information is known about diesel injection systems.

BenzDiesel