I don't think I would use a drum that had contained motor oil.
I would search more for a drum that held food grade product or buy a new one.
It is just not worth the chance, IMHO.
Drumhead - UDS x 2 & UDG
Keep on Smokin'
KC native missin' KC
IMBAS Certified MOINK Baller 2009
I also support PETA - People Eating Tasty Animals