Every manufacturer seems to vary a hell of a lot as far as oil change increments go. It's safe to assume though, that with change increments like that, they expect you to go a little longer. I believe most new Mercedes come with Mobil 1.
Consider that during cross-country races, cars are driven much harder at higher temperatures and much tougher conditions on only a single fill of oil. I think the Dakar Rally is probably one of the best examples (I remember this only because I think Mobil 1 did a commercial about how they're used in a few DR teams).
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-Phil
"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."
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