I've got problems now....

Turns out I've got oil in the tube connecting the supercharge to the intake. Shop thinks the Supercharger is leaking oil somehow, however I really haven't noticed the car losing oil (then again I really haven't been checking too closely). Anyways, shop thinks this could be causing the check engine light to come on and the detonation. Cars going back to the shop to have this cleaned up. Anyway, looking for anyone's input on the oil thing. Thanks!