When you ask a question about oil on these forums. You should know better by now...
Everyone here has an opinion (especially about motor oil and antifreeze), and we will all offer our own personal suggestion. Many of those opinions will be in direct opposition to each other. Just some are better researched than others.
If you don't mind me saying so, if I wanted a simple viscosity answer, it's already in my owner's manual. If I was still confused, I'd call my local MB dealer, and ask what they'd use. That way, I'd have one informed answer from an authority that is both familiar with my car and climate first hand.
Bo, I hope that you share my belief that these forums aren't a contest, but an opportunity to learn more than we knew before we came here. I'd rather be wrong most of the time, and learn something new, than be right most of the time and have people think that was all I lived for...
I never said that diesel grade motor oil was inferior, I just pointed out that it WAS diesel grade motor oil. Unfortunately, you did just what I was afraid you might do. You regarded my remarks as a challenge of your knowledge instead of as a suggestion that there was more to learn. So you decided you needed to defend your remarks without reading the oil threads that I and many others put a lot of time and energy into posting.
If you really want to know more about motor oil, read the links I posted and then get back to me. I'd love to hear your opinions, and if you like, debate any issues you would care to bring up.
But I hate having to go all over it again each time someone asks a question or states an opinion about motor oil.