octane SUBARU IMPREZA 2001 2.G Owners Manual

7-4
Fuel requirements
Fuel octane rating
Your eng ine is d esig ned to use only unlead ed g asoli ne with an oc tane
rating of 87 AKI or hig her. This oc tane rating is t he averag e of the Re-
searc h Oc tane and Motor Oc tane numb ers and is c ommo nly referred
to as the Anti Knoc k Ind ex (AKI).
Using a g asoline with a lower oc tane rating c an c au se p ersistent and
heavy knoc king , whic h c an d amag e the eng ine. Do not b e c onc erned
if your vehic le sometimes knoc ks lig htly when you d rive up a hill or
when you ac c elerate. See your d ealer or a q ualified servic e tec hni-
c ian if you use a g asoline with the sp ec ified oc tan e rating and your
vehic le knoc ks heavily or p ersistently. Unleaded gasoline
The nec k of the fuel filler p ip e is d esig ned to ac c ep t only an unlead ed
g asoline filler nozzle. Und er no c irc umstanc es shou ld lead ed g aso-
line b e used b ec ause it will d amag e the emission c o ntrol system and
may imp air d riveab ility and fuel ec onomy. Gasoline for California-certified LEV
Your vehic le was c ertified to California ’s low emission vehic le (LEV)
stand ard s as ind ic ated on the und erhood tune-up lab el. It is d esig ned
to op timize eng ine and emission p erformanc e with g a soline that
meets the c lean b urning low-sulfur California g asol ine sp ec ific ations.
If you live in any other state than California, you r vehic le will op erate
on g asoline meeting Fed eral sp ec ific ations. Gasolin e sold outsid e
California is p ermitted to have hig her sulfur level s, whic h may affec t
the p erformanc e of your vehic le ’s c atalytic c onverter and may p ro-
d uc e a sulfur exhaust od or or smell. SUBARU rec omme nd s that you
try a d ifferent b rand of unlead ed g asoline having l ower sulfur to d eter-
mine if the p rob lem is fuel related b efore returnin g your vehic le to an
authorized d ealer for servic e.