A review of the history and problems of 2-cycle engine lubrication is presented, together with the results of tests comparing ash bearing oils and ashless oils, premium and regular grade gasoline, various size engines, and various combinations of these. Results measures were spark plug failure, combustion chamber deposits, piston ring sticking, piston varnish, exhaust port plugging, cylinder wear, and crankcase deposits. Additives are needed to overcome problems of bore wear on light weight air cooled 2-cycle gasoline engines.
