Fuel & Oil; Gasoline Recommendations - Mercury 10/15 Sea Pro/Marathon - 6/8/9.9/10/15 HP User Manual

Gasoline Recommendations

UNITED STATES AND CANADA
Use a major brand of automotive unleaded gasoline with a minimum posted
octane rating of 87. Mid-grade automotive gasolines that contain fuel
injector cleaner are preferred for added internal engine cleanliness. Leaded
gasoline is not recommended.
INTERNATIONAL
Use a major brand of automotive unleaded gasoline with a minimum posted
octane rating of 90RON. Automotive gasolines that contain fuel injector
cleaner are preferred for added internal engine cleanliness. Leaded
gasoline is acceptable in areas where unleaded gasoline is not available.
USING REFORMULATED (OXYGENATED) FUELS - UNITED
STATES ONLY
This type of fuel is required in certain areas of the United States. The two
types of reformulated ingredients in these fuels are alcohol (Ethanol) or
Ether (MTBE or ETBE). If Ethanol is the oxygenates that is used in the
gasoline, refer to Alcohol in Gasoline.
These reformulated fuels are acceptable for use in the Mercury engine.
ALCOHOL IN GASOLINE
We do not recommend the use of gasoline which contains alcohol because
of the possible adverse effect the alcohol may have on the fuel system. In
general, if only gasoline containing alcohol is available, it must not contain
more than 10% ethanol or 5% methanol, and the addition of a water
separating fuel filter is recommended.
If gasoline containing alcohol is used or if you suspect the presence of
alcohol in your gasoline, increase your inspection of the fuel system,
visually checking for fuel leaks or abnormalities.
Gasoline containing alcohol may cause the following problems to your
outboard and fuel system:
• Corrosion of metal parts
• Deterioration of elastomers and plastic parts
• Wear and damage of internal engine parts
• Starting and operating difficulties
• Vapor lock or fuel starvation
Some of these adverse effects are due to the tendency of gasoline
containing alcohol to absorb moisture from the air, resulting in a phase of
water and alcohol which separates from the gasoline in the fuel tank.
FUEL & OIL
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