I recently asked this question but did not get any response. I have a 2004 Rhino with about 2,000 miles. I noticed a lot of oil on my garage floor. I discovered it is pumping a large amount of oil from the crankcase breather tube into air box. I took my secondary muffler off because someone said I was getting a lot of back pressure. There is less air coming out of the crankcase tube but it still is pumping oil. in about 5 miles I had to add 1/2 quart. It does not smoke through the exhaust.