A Stihl chainsaw uses an automatic oiler, which is an adjustable screw that regulates the output of oil from the pump. This screw will increase or decrease oil flow to the bar and chain during cutting. The screw -- a semi-manual setting -- can't stop the oil completely; the oil pump is automatic. The user simply has control over the volume. The operator, therefore, isn't forced to worry about lubrication during cutting, since the oil pump activates regardless once a specific engine speed is reached.
Unscrew the oil container cap by turning it counterclockwise. Lift off the cap. Fill the oil tank with bar and chain oil. Tighten the cap clockwise into place.
Turn the chainsaw upside down. Locate the oiler screw on the underside. It will be marked with an oilcan icon with a "+" and "-" symbols beside it. Place the screwdriver into the screw.
Turn the oiler screw toward the "+" sign to increase oil volume. Turn the oiler screw toward the "-" sign to decrease volume. Start the chainsaw and let it warm up.
Hold the tip of the bar 2 inches from a piece of wood. Depress the throttle trigger for 10 seconds. Let go of the throttle and check the wood for oil. When lubricating properly, a light splattering of oil will hit the wood. Stop the chainsaw and adjust as needed.
If oil test produces no oil splatters, stop the chainsaw and clean the entire oil system.