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.
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (194,000)
1999 E300 Turbodiesel (244,000 miles, dies at 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles)
2011 Audi A4 Avant (129,000 miles) hate this car!
BMW 330 xi 6 speed manual (100,034 miles)