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I would consider at least running the MB supplied Mobil1 until the end of the warranty period, then switching to your favorite after that.
Not only is it a waste of money (IMHO) to not take advantage of the free Mobil1, but I would also be concerned about the implications to the warranty if there were an oil-related engine failure. Not that it's likely to happen, and if it were I would doubt the oil would be a contributing factor, but theres always a chance.
Gilly
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