Im am pretty sure this is normal so. Just like a second opinion. When i ride my 09 street glid there oil is coming from my air cleaner. I do not have the stock one on the bike i have the screaming eagle big sucker air cleaner. not the regular scream eagle air cleaner. i have noticed more so when the bike is really hot riding all day then short rides. i have been told its normal for these motors. i have not ever seen it on my fatboy but agian it has a diff air cleaner on it.