Guys I have a Craftsman garden tractor, about 6 years old, that all of a sudden is burning a lot of oil. It's a 19.5 hp single cylinder engine. I have to top it off after running it about 2-3 hours. Its not leaking, no puddles. I do see a lot of greasy buildup around the exhaust. I get a cloud of blue smoke when I throttle up from idle too. It runs fine. Is this something that could be easily fixed/overhauled or should I be on the hunt for a replacement engine? I am mechanically inclined, used to work on Honda Motorcycles 20 years ago, haven't ever worked on a Briggs engine before so don't know much about them. Thanks for any advice you can share.