Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 8Get this manual
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Oil Recommendations ACAUTION
Imperial Measure 30 Impozto each Impgallons of gasoline
Use 25:1 Ratio as shown above
50:1 NORMAL FUEL MIXTUREWITHOUT AutoBlend and 50:1 BREAK-IN