Breather filters are stupid and they just clog up with oil if you put one on. The hose that goes from the valve cover to the intake is part of the pcv system the other part is the hose that goes from IM to the Valve cover. The system cleans out the oil in and gets fresh air in then the bad gets pushed out through the intake to be burned off. There is only ONE remedy to get rid of the oil. Its called a Oil catch can. So yeah there is a reason they sel those. You can just make your own. Using a filter from lowes and running your own hoses. I dont meant to like an ass or anything, but breathers are stupid.