Picked up a used 2011 grizzly a week ago, got a clean bike with just under 1000 miles on it. Changed out the coolant and oil, along with a new Spark plug and oil filter. While doing maintenance I noticed the airbox was really oily, figured it was just the previous owner over oiling. Wiped it out and drained the full hose coming out of the box. After some riding I notired there’s oil in the box again, along with that drain hose a couple inches full. Is this anything to be alarmed about or is it normal?