Euro car techies I have an oil question.....

The wife has a Mercedes c320. The add oil light came on. I call the dealer that serviced it last and they said Mobil 1 synthetic 5w40. I go to O'reillys and they have mobil 1 syn 5w40 that is specified for turbodiesel motors. They didn't have any other 5w40s in the Mobil1 brand. The question is will the diesel stuff be the same? I figure 5w40 is 5w40 right? I don't want to put the wrong stuff in and the wife leaves early before the dealership opens tomorrow.

Pretty sure I need Evan to chime in.....


Thanks!!!