Look next to the valve cover near the rear, driver's side, between the air cleaner housing and the first firewall. It is much smaller than the older Benzes. Maybe 3" across, and you need a special wrench for it.

Do a search here for "what oil" and you will see every type, brand, source, size, weight, coler, and taste of oil recomended. Use the Castrol if that's what you like. It will do just fine.

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport