Mercury 300 XS OptiMax User Manual

FUEL AND OIL
42 eng
• 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.
Oil Recommendation
Recommended oil
Mercury Racing 2‑Stroke Oil
Alternate oil
OptiMax DFI engine oil
Premium Plus 2‑Cycle Outboard Oil
Mercury Racing 2‑Stroke Oil is recommended for OptiMax engines that are
used in applications of extreme loads associated with commercial, work, or
extended periods of high RPM. The added lubrication and protection properties
with Mercury Racing 2‑Stroke oil, maximizes engine horsepower while
protecting against heat, reduces wear and carbon deposit build‑up.
OptiMax DFI engine oil or Premium Plus 2‑Cycle Outboard Oil can be used as
an alternate oil.
IMPORTANT: Oil must be NMMA certified TC‑W3 2‑Cycle oil.
Periodically consult with your dealer to get the latest gasoline and oil
recommendations. If Quicksilver 2‑Cycle Outboard Oil is not available,
substitute another brand of 2‑Cycle outboard oil that is NMMA Certified TC‑W3.
The use of an inferior 2‑Cycle outboard oil can reduce engine durability.
Damage from use of inferior oil may not be covered under the limited warranty.
Fuel Additives
To minimize carbon deposit buildup in the engine, it is recommended to add
Mercury or Quicksilver Quickstor fuel stabilizer additive to the engine's fuel at
each tank fill throughout the boating season. Use additive as directed on
container.

Mercury 300 XS OptiMax Specifications

General

Brand	Mercury
Model	300 XS OptiMax
Category	Outboard Motor
Language	English