Oil in Airbox

Every time I check my Air filter there is some oil in the Airbox. Not huge amounts but enough that I wipe it out with a paper towel. I am assuming it is oil off the Foam Element that has dripped down and not engine oil. I follow the filter Cleaning method exactly but I still have the oil every time I check it.

Is this normal?

Oil in Airbox

Every time I check my Air filter there is some oil in the Airbox. Not huge amounts but enough that I wipe it out with a paper towel. I am assuming it is oil off the Foam Element that has dripped down and not engine oil. I follow the filter Cleaning method exactly but I still have the oil every time I check it.

Is this normal?