Oh, geez. Motor oil is probably the most controversial subject on this site.
Just do a search for "oil" or "synthetic", and you will have enough reading to keep you up all night for a week with no sleep.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".