Albert, if you specifically instructed the service advisor to install dino oil then politely insist that they change out the synthetic oil and credit you the difference. I had the reverse happen at my local MB dealer a few years ago on our 1992 300CE when the head gasket was being replaced under a Starmark Warranty. The service advisor never bothered to ask what type of oil I use, but when we discussed it after the tech had already installed dino oil he apologized, bought 2 cases of Mobil 1 15W50, changed the oil and gave me the 4 1/2 extra quarts.

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Fred Hoelzle