Bum bulb. Looks like the gas is off in it. If it is a filament issue usually one end will light and the other will be more magenta. Nothing you can do about it.
Of the thousands of bulbs I have changed out Phillips were the worst for bad ones out of the box.
His question was not about oil. His saw has a setting that you change for winter and summer.
The setting you saw operate a shutter that allows warmer air to come into the air intake to keep the filter and carb from icing up. Saws are operated close the ground in the snow in winter and can...