"The Manhattan store is the only company-owned dealership in the country, and the flagship of Mercedes’ Autohaus project"Also remember that in the US, with a few controversial exceptions (e.g. Tesla) not only are car dealers not owned by the manufacturer, but it is illegal for them to be so. It is also illegal for them to set prices for the sale, service, and repair of said cars and their parts. That's why it's called MSRP or "Manufacturers *Suggested* Retail Price".
8 qts. seems like a lot of oil for a four banger. Is that how MB is getting the extended intervals as in, "more volume of oil, the longer it takes for it to become contaminated"?