If it has been routed that way for a while, and the issue just started, your oil may be diluted with fuel. that raises the oil level and thins it out. A stuck open float in the carb can cause that. smell the dipstick... if it smells of fuel, change the oil and see if the problem persists. Also, use a piece of hose from the breather to an old soda bottle zip tied under the hood somewhere (drill a hole in the cap big enough for the hose to go in. gatorade bottles seem a little more rigid than soda bottles) this will let you see how much oil it's pushing out and contain the mess