1991 Johnson/Evinrude EI 60 thru 70 outboards Service Manual, Page 29Get this manual
Break-In Procedure During the first 10 hours of break-in operation you must use 50:1 fuel oil ratio in your fuel tank in addition to the operation of the Oil Injection System After the 1O-hour break-in period, check to see that the oil level in the tank has changed, indicating that oil has been used before using unmixed gasoline in the fuel systemIf the system is disconnected or the engine is not equipped with 25: fueloil ratio in the fuel tank for the first 10 hourssystem, you must use a
To help ensure long engine life and prevent serious engine damage, using additional oil in the fuel is mandatory during the first few hours of operation of: new engine used engine with new powerhead used engine with newly rebuilt powerhead