I have a 02 lighting,and I noticed after I changed my air filter there was oil on the filter and in the air box.I found out that it was coming from the supercharger.The truck is stock I have not done anything to it yet,but I wanted to know if there is a problem with the supercharger any help would be great thanks.

 

The blower gear drive runs in oil.
The seals have to work under both pressure and vacuum.
I think you have a seal going unless there is a chance that crankcase pressure is causing oil to be forced thru the PCV system into the intake.