Lots and lots of info about oil, oil changes, oil types and brands. What year and model car do you have? My '99 E300TD oil change costs about $110 so I bought a topsider and do it myself much cheaper now. The wagon generally costs about $60 so I do that car more often and much cheaper now than the dealer can.

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles