Lawn tractor using oil
I have a Husqvarna lawn tractor that has suddenly started using oil about 2 weeks ago. There is not a cloud of smoke coming from the exhaust, just brief wisps of blue tinged smoke from time to time, but it is using about half a quart for each hour of run time. I have kept the oil and filter changed per the owner's manual. It now has about 165 hours and was bought on 3/18/04. The engine is a Briggs & Stratton 21 hp OHV V-twin ELS 656. It has worked great up until now, and is still working great, but I have to keep a close watch on the oil level. Any thoughts will be greatly appreciated.