1970 Evinrude Ski-Twin, Ski-Twin Electric 33 HP Service Manual 4687, Page 2Get this manual
EVINRUDE OUTBOARD OIL We recommend using EVINRUDE OUTBOARD OILEVINRUDE OUTBOARD OIL is designed specifically for Evinrude outboard motor use at 50 to gasoline to oil ratio for engine break in and after break in, new and older modelsThis improved lubrication is formulated to provide additional benefits such as: exceptional lubrication, less varnish and combustion chamber deposits, better spark plug life, good mixability with gaSOline even in cold weather, and reduction of pre-ignition If Evinrude Outboard Motor Oil should not be available, see Oil Instructions Section 2