Engine Oil Requirements; Fuel Requirements; Gasoline - Yamaha F15C Owner's Manual

Specifications and requirements
EMU31442

Engine oil requirements

Recommended engine oil:
YAMALUBE 4-M FC-W oil or 4-stroke
motor oil with a combination of the fol-
lowing SAE and API oil classifications
Engine oil type SAE:
10W-30 or 10W-40
Engine oil grade API:
SE, SF, SG, SH, SJ, SL
Engine oil quantity (excluding oil filter):
1.6 L (1.69 US qt, 1.41 Imp.qt)
If the recommended engine oil grades are
not available, select an alternative from the
following chart according to the average
temperatures in your area.
EMU36360

Fuel requirements

EMU36780

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. Yamaha re-
comends that you use alcohol-free (see
18
Gasohol) gasoline whenever possible.
Recommended gasoline:
Regular unleaded gasoline with a min-
imum Octane rating of 86 (Pump Oc-
tane Number) = (R+M)/2
ECM01980
NOTICE
Do not use leaded gasoline. Leaded
●
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
There are two types of gasohol: gasohol con-
taining ethanol (E10) and that containing
methanol. Ethanol can be used if the ethanol
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.
It is recommended that you install a water-
separating marine fuel filter assembly (10
micron minimum) between your boat's fuel
tank and outboard motor when using etha-
nol. Ethanol is known to allow moisture to be
absorbed 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.