Honda Ridgeline Owner's Manual page 256

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.
Do not tow a trailer.
You should also follow these
recommendations with an
overhauled or exchanged engine, or
when the brakes are replaced.
248
Fuel Recommendation
Your vehicle is designed to operate
on unleaded gasoline with a pump
octane number of 87 or higher. Use
of a lower octane gasoline can cause
a persistent, heavy metallic rapping
noise that can lead to engine damage.
Premium fuel is recommended when
towing in certain conditions (see
page 305 ).
To help prevent harmf ul f uel system
and engine deposits, use high quality
f uel containing detergent and additives.
In addition, in order to maintain good
perf ormance, f uel economy, and
emissions control, we strongly
recommend the use of gasoline that
does NOT contain harmf ul manganese-
based f uel additives such as MMT, if
such gasoline is available.