Has anyone used Shell Rotella T6 Full Synthetic oil in their Crossfire? I recently purchased my car from a dealership, so I assume it has 0w-40 in it. I wanted to make the switch to 5w-40, and Shell Rotella seems to a lot cheaper as opposed to Mobil-1.

It says it meets MB approval for the 228.31 specification...

I'm not quite sure what the specs are for our engines?

Help please!