Chrysler 75 and 85 HP Outboards Service Manual OB 3646, Page 12Get this manual
_ GENERAL SERVICE INFORMATION MOTOR IDENTIFICATION
Figure shows the motor serial number and model number, located on the identification plate attached to the support plateAlways use these numbers in correspondence to identify the motor and ensure that correct parts are obtained Fuel SelectionAutomotive gasoline lead free, regular leaded or premium leaded having minimum octane number of 85 may be used See Table 1
WARNING
Gasoline is extremely flammable and highly explosive under certain conditionsDo not fill fuel tank while motor is running Do not smoke or allow open flames or sparks near boat when refueling Mix fuel in well ventilated area Outboard OilUse Chrysler Outboard Oil which is BIA certified TC-W OilWhen Chrysler Outboard Oil is not available, the following may be usedNext choice Any other BIA Certified TC-W OilHigh quality SAE-40 Heavy Duty
For emergency outboard oil
FuelOutboard Oil MixWhen buying pre-mixed fuel make sure 50 to ratio is used To mix fuel with outboard oil, proceed as follows :