Ya, what he said. Get 1/2" drive, and clean the head of the bolt out first.
Very Very tight.

Pull the bottom plug and just change the oil.

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