Yes I am indeed a Delo fan and use it in everything from my diesels to my lawnmower. The C was the first car in which I began using Mobil One. If it's good enough for Benz, it's good enough for me.
I stretch my oil changes with this car, but not much further than my other cars with Delo. I let the dealer change it according to the FSS, and change between their intervalse with Mobil One and a fresh filter.
Have a great day,