My John Deere LX-176 has been intermittently blowing out blue/white smoke on start up and it seems to be happening more frequently. It lasts for about 1-3 minutes or so, heavy at first start up and then tapering off. I had read the earlier post on white smoke, checked my oil and it was not over filled. Tractor had been sitting level also. Am I looking at an engine rebuild? I've owned this tractor for about 7-8 years and have only used it on my own lawn. I can't believe the engine is worn out already. The engine is a Kawasaki 14HP ohv with oil filter. Thanks for any advice, Joel B.