Oil on bottom of air pump?

[sunil6784]

I Was under my car today doing my sway bar bushings and took a glance around. The air pump has a lot of oil/sludge on it. I looked for leaks but couldn't find any. Also, is there supposed to be a screw on the bottom of it? I saw a threaded hole but there was no screw or anything on it...

 

[sunil6784]

ttt

 

[DMAN302]

I don't see how oil could collect in the pump area...likely coolant combined with dirt. I would simply clean the area..drive a while and inspect.