The fuel system components on your Mercury engine will withstand up to 10%
alcohol content in the gasoline. We do not know what percentage your boat’s
fuel system will withstand.
Fuel containing alcohol may increase:
• Corrosion of metal parts.
• Deterioration of rubber or plastic parts.
• Fuel permeation through rubber fuel lines.
• Starting and operating difficulties.
IMPORTANT: Operating a Mercury Marine engine with gasoline containing
alcohol creates unique problems as a result of long storage periods common to
a boat. Cars normally consume alcohol‑blend fuels before they absorb enough
moisture to cause problems; however, boats often sit idle long enough for
phase separation to occur. In addition, alcohol can wash protective oil films
from internal components causing corrosion.
IMPORTANT: Because of possible adverse effects of alcohol in gasoline, it is
recommended that only alcohol‑free fuel be used where possible.
If only fuel containing alcohol is available, or if the presence of alcohol is
unknown, increased inspection frequency for leaks and abnormalities is
required.
Low Permeation Fuel Hose Requirement
Low permeation fuel hose must be installed on all sterndrive engine packages
that are manufactured for sale, sold, or offered for sale in the United States.
• The Environmental Protection Agency (EPA) requires that any sterndrive
engine package manufactured after January 1, 2009, must use low
permeation fuel hose for the primary fuel hose connecting the fuel tank to
the engine.
• Low permeation hose is USCG Type B1‑15 or Type A1‑15, defined as not
exceeding 15/gm²/24 h with CE 10 fuel at 23 °C as specified in SAE J
1527 ‑ marine fuel hose.
Crankcase Oil
OIL RECOMMENDATIONS
Preferred Oils
NMMA Classification
Mercury Racing 4‑Stroke Oil, 25W‑50 Synthetic Blend,
or 25W‑40 Sterndrive/Inboard Oil
FC‑W
®
Use a new oil filter with every oil change
SPECIFICATIONS
eng 25
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