Re: Dealer using different oil in oil change
Just had my double wrench service done at the Chrysler factory service center that works on company cars and they used 5W-40 synthetic oil. Explanation was that MB nows allows either 0W or 5W-40 to be used and meets their 229.5 spec.
If you search bobistheoilguy.com, you'll see some discussions that Pennzoil European Formula 5W-40 is preferred over Mobil 1.
Don't think you'll go wrong with either.