Mercury Mariner Outboards 2.2 / 2.5 / 3.0 Service Shop Manual, Page 8Get this manual
Fuel Recommendations Gasoline Recommendations
AWARNING
Use CARE when transporting fuel container, whether in boat or carDO NOT fill fuel container to maximum capacityGasoline will expand considerably as it warms up and can build up pressure in the fuel containerThis can cause fuel leakage and potential fire hazard
FUEL MIXTURE
Use 50:1 gasoline-oil ratio for "break-inand all normal operation of your outboard motor(See chart, following
U.SMeasure Quicksilver 2-Cycle Outboard Oil Other Acceptable Oils 16 U.Sozto each gallons of gasoline Imperial Measure 15 impozto each impgallons gasoline Metric Measure
400cc to each 20 liters of gasoline
Any gasoline, that will satisfactorily operate an automobile engine, is suitable for your outboard motorIMPORTANT: While the use of REGULAR LEADED gasoline is entirely satisfactory (and most commonly available), LEAD FREE or LOW LEAD regular gasolines are PREFERRED, as they generally provide an "extra margin" of spark plug life