You are missing a dealer service!

Oil changes are very important for an engine, especially a mercedes engine, they need to be well lubricated and they can last.

The dealer inspects a lot of other stuff in an oil change. You should go talk to your service advisor and see the two pages of check lists they do when they change their oil. Some things I can think of, is inspection of rubber parts, inspection of all the other places that require fluids, check air pressure.

Do you think walmart employees even know how to do that?

Remember Mercedes techs, have to be in the upper 10%- 15% of their class to even get into Mercedes school.

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Current Stable:
1994 S500 v140, 210k miles, white with grey.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now)
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020)
1992 500E 156k mi sold
etc.