Fuel Requirements; Gasoline; Muddy Or Acidic Water - Yamaha F15C Owner's Manual

If oil grades listed under Recommended en-
gine oil grade 1 are not available, select an
alternative oil grade listed under Recom-
mended engine oil grade 2.
Recommended engine oil grade 1
SAE
-4 14 32 50
-20 -10 0 10
10W–30
10W–40
5W–30
Recommended engine oil grade 2
SAE
-4 14 32 50
-20 -10 0 10
15W–40
EMU36361

Fuel requirements

EMU40202

Gasoline

Use a good quality gasoline that meets the
minimum octane rating. If knocking or ping-
ing occurs, use a different brand of gasoline
or premium unleaded fuel.
Recommended fuel:
Regular unleaded gasoline
Min. research octane number (RON):
90
ECM01982
NOTICE
Do not use leaded gasoline. Leaded

Specifications and requirements
API
68 86 104 122˚F
20 30 40 50˚C
SG
SH
ZMU06854
API
68 86 104 122˚F
20 30 40 50˚C
SH
20W–40
20W–50
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gasoline can seriously damage the en-
gine.
Avoid getting water and contaminants

in the fuel tank. Contaminated fuel can
cause poor performance or engine
damage. Use only fresh gasoline that
has been stored in clean containers.
Gasohol
SE
There are two types of gasohol: gasohol con-
SF
taining ethanol (E10) and that containing
methanol. Ethanol can be used if the ethanol
SJ
SL content does not exceed 10% and the fuel
meets the minimum octane ratings. E85 is a
fuel containing 85% ethanol and must not be
used in your outboard motor. All ethanol
blends containing more than 10% ethanol
can cause fuel system damage or cause en-
gine starting and running problems. Yamaha
does not recommend gasohol containing
methanol because it can cause fuel system
damage or engine performance problems.
SJ
SL
It is recommended that you install a water-
separating marine fuel filter assembly (10 mi-
cron minimum) between your boat's fuel tank
and outboard motor when using ethanol.
Ethanol is known to allow moisture to be ab-
sorbed into boat fuel tanks and systems.
Moisture in the fuel can cause corrosion of
metallic fuel system components, starting
and running complaints and require addition-
al fuel system maintenance.
EMU36881

Muddy or acidic water

Yamaha strongly recommends that you have
your dealer install the optional chromium-
plated water pump kit if you use the outboard
motor in muddy or acidic water conditions.
However, depending on the model it might
not be required.
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