Acura Integra 1987 Manual page 47

Gasoline
For proper operation of your car's emission controls, your engine
is designed to use unleaded fuel only.
C A U TIO N : Using leaded or even low-lead gasoline could damage
some of your emission controls, and also void their coverage under
the emission controls warranty.
You can use any brand of gasoline from pumps labelled unleaded
with an antiknock index of 86 or higher as calculated using the
Cost of Living Council formula (equal to 91 Research Octane
I
Number or higher). Use of a lower octane gasoline can cause per­
sistent, heavy "spark knock" (a metallic rapping noise), which can
lead to engine damage if severe.
C A U TIO N : If you notice steady spark knock while holding a
steady speed on a level road, try changing brands of gasoline. If
the spark knock persists, consult your Acura dealer. Failure to do
so is considered misuse, and misuse is not covered under the New
Car Warranty.
Occasionally you may notice light spark knock while accelerating
or driving up hills. This is no cause for concern, it simply means
your engine is running at its most economical.
Gasoline Containing Alcohol
If you decide to use a gasoline containing alcohol ("gasohol"), be
sure its octane rating is at least as high as that recommended for
unleaded gasoline. There are two types of "gasohol": that
containing ethanol, and that containing methanol. Do not use
gasohol that contains more than 10% ethanol. Do not use gasoline
containing methanol (methyl or wood alcohol) that does not also
contain cosolvents and corrosion inhibitors for methanol. Never
use gasoline containing more than 5% methanol, even if it has
cosolvents and corrosion inhibitors.
NOTE:
• Fuel system damage or vehicle performance problems resulting
from the use of such fuels is not covered under new car warran­
ties. The Acura Automobile Division cannot endorse the use of
fuels containing methanol since evidence of their suitability is
as yet incomplete.
• Before purchasing fuel from an unfamiliar station, try to confirm
whether the fuel contains alcohol, and of what kind and how
much. If you notice any undesirable operating symptoms after
using a gasoline that contains alcohol; or one that you think con­
tains alcohol, switch to an unleaded gasoline as recommended.
44