1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 14Get this manual
FUEL RECOMMENDATIONS GASOLINE RECOMMENDATIONS
REGULAR LEADEDPREMIUMLOW-LEA and LEADFREE AUTOMOTIVE CASOLl NFS ""iih MI NIM UM PUMP
POSTED OCTANE RATI 0[86 (Research Oclane Number
90) are satisfa ctory and recommended
2 hoursthe mOlor may run at any speedalthough sustained operation at fu ll th rollie should be avoided fo an additional eight (8) hours
BREAK-IN FUEL MIXTURE (25:1 RATIO) UM .S.aufIm",rlllur 30 ImpOz Oil to EachS ImpGalGasol ine trlc ur800cc Oil 10 Each 20 liters 01 Gasoline
AUSTR ALi A: he on ly approved gasolines fo r
V -6 models are LEA DED SUPER nd PR E
MI UM with minim um esea rc oClane number
Formula 50-0 Oth,r Acctplabl
94NO TE: Some fuel distributors pre-mix garoline and oil for .cycJe enginesSuch if known 10 be of recommended
32 U.SOzOil to Each6 Gal01 Gasoline