I would love to do a muffler mod, or buy a modded muffler. However, that idea has been vetoed (for now) by my wife, who didn't love the idea of making a loud saw possibly even louder!Unburnt oil puddles in the crankcase when the saw is shut off, thats the puff of smoke you see when it is first started up. That excess oil is what keeps everything coated and protected from corrosion when the saw is off and stored, Protected when the saw is running from heat from friction. The 1/4 teaspoon or less of oil you see dribbling from the muffler is no real concern. Next up you need to look at modifying the muffler conservatively to further reduce heat and increase exhaust flow, the bonus is a hair more power and less oily mess from the muffler.