Fuel And Oil; Gasoline Recommendations; Oil Recommendation; New Engine Gasoline/Oil Break-In Mixture - Mercury 140 Service 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.
The adverse effects of alcohol are more severe with methanol and are worse with increasing content of alcohol.

Oil Recommendation

Recommended Oil
IMPORTANT: Oil must be NMMA certified TC-W3 2-Cycle oil.
Mercury or Quicksilver Premium TC-W3 2-Cycle oil is recommended for this engine. For added protection and
lubrication, Mercury or Quicksilver Premium Plus TC-W3 2-Cycle oil is recommended. If Mercury or Quicksilver
outboard oil is not available, substitute another brand of 2-cycle outboard oil that is NMMA Certified TC-W3. Severe
engine damage may result from use of an inferior oil.

New Engine Gasoline/Oil Break-in Mixture

MODELS WITH ELECTRONIC FUEL INJECTION (EFI)
Do not use pre-mixed gas and oil during break-in. The engine automatically receives extra oil during engine
break-in.
MODELS WITH CARBURETORS
Use a 50:1 (2%) gasoline/oil mixture in the fuel tank for the first 114 liters (30 gallons) of fuel. Refer to the following
table for mixing ratios. Use of this fuel mixture combined with oil from the oil injection system will supply adequate
lubrication during engine break-in.

FUEL AND OIL

Mercury or Quicksilver Premium 2-Cycle TC-W3 Outboard Oil
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