Modern saws and certainly the most popular stihl, the 290, use a very small amount of bar oil. I believe that the greenies had a part in that. My 290 has an adjustable flow regulator that is maxed out all the time and still always has about half a tank of oil left when the fuel runs out. Noticeably higher oil consumption in the warmer weather when the oil thins down some. Back in the old days you could rev a saw and fling bar oil off visibly, not so with the modern Stihl 290.