This STIHL High Performance oil is a quality 2-cycle engine oil developed for all STIHL products and especially suitable for professional chainsaws. •2.6 oz. bottle makes 1 gallon mix •5.2 oz. bottle makes 2 gallon mix •6.4 oz. bottle makes 2 1/2 gallon mix •12.8 oz. bottle makes 5 gallon mixThe drive shaft is obviously longer than it is and is stopped by the bearing and also a keeper on the splined shaft that sits about a 1/2 inch past the end of the drive shaft. Neither can go through the bearing beacause that is what keeps the shaft from getting out of the clutch drum. A. They gave me the wrong part. B.