Honda Civic Sedan 2005 Owner's Manual page 123

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Break-in Period, Fuel Recommendation
Break-in Period
Help assure your vehicle's future
reliability and performance by paying
extra attention to how you drive
during the first 600 miles (1,000 km).
During this period:
Avoid full-throttle starts and rapid
acceleration.
Avoid hard braking for the first
200 miles (300 km).
Do not change the oil until the
scheduled maintenance time.
You should also follow these
recommendations with an
overhauled or exchanged engine, or
when the brakes are replaced.
122
Fuel Recommendation
Your vehicle is designed to operate
on unleaded gasoline with a pump
octane number of 86 or higher. Use
of a lower octane gasoline can cause
a persistent, heavy, metallic rapping
noise in the engine that can lead to
mechanical failure.
On vehicles with manual transmission
You may hear a knocking noise from
the engine if you drive the vehicle at
low engine speed (below about 1,000
rpm) in a higher gear. To stop this,
raise the engine speed by shifting to
a lower gear.
We recommend using gasoline
containing detergent additives that
help prevent fuel system and engine
deposits.
In addition, in order to maintain good
performance, fuel economy, and
emissions control, we strongly
recommend, in areas where it is
available, the use of gasoline that
does NOT contain manganese-based
fuel additives such as MMT.
Use of gasoline with these additives
may adversely affect performance,
and cause the Malfunction Indicator
Lamp on your instrument panel to
come on. If this happens, contact
your dealer for service.
Some gasoline today is blended with
oxygenates such as ethanol or
MTBE. Your vehicle is designed to
operate on oxygenated gasoline
containing up to 10 percent ethanol
by volume and up to 15 percent
MTBE by volume. Do not use
gasoline containing methanol.
If you notice any undesirable
operating symptoms, try another
service station or switch to another
brand of gasoline.
For further important fuel-related
information, please refer to your
Quick Start Guide .