looks like the rear main seal might be fried. Pull the inspection cover off the bellhousing and take a look inside. Also check out the rear of the intake manifold, and the valve cover gaskets. They can leak oil onto the back of the motor which CAN get into the bellhousing, and all over around it.
At the least, take that thing to a car wash and get it clean!
![Evil :evil:](./images/smilies/icon_evil.gif)