Has the oil been changed lately? A lot of times over filling the oil will cause oil to blow back thru the carburetor, Also if the air filter got caked with mud running the box with no lid or allot of dirt in the filter. The engine will try to use the crankcase breather hose as an air intake since not enough air was coming in the conventional way, therefore sucking in oil. Has it smoked at all? Sometimes if you try to shut it off oil will run back down the intake tubes into the air box. This may be applicable to your engine that the breather is being used to **** oil into the box due to lack of fresh air intake.
The other possibilities would be crank case pressure pushing the oil in (piston ring blow by), but that should (theoretically) result in low compression (since the cylinder pressure is getting to the crankcase instead of staying in the cylinder), the oil is overfull and being pushed out since air will compress but liquid will not, or poor crank case ventilation system design (but if that were the case likely there would be a recall as that would directly effect emissions which is federally regulated).
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