Oldsmobile 2001 Alero User Manual download pdf (Page 242)

6-4

Be sure the posted octane is at least 87. If the octane is

less than 87, you may get a heavy knocking noise when

you drive. If it’s bad enough, it can damage your engine.

If you’re using fuel rated at 87 octane or higher and you

hear heavy knocking, your engine needs service. But

don’t worry if you hear a little pinging noise when

you’re accelerating or driving up a hill. That’s normal,

and you don’t have to buy a higher octane fuel to get rid

of pinging. It’s the heavy, constant knock that means

you have a problem.

If your vehicle is certified to meet California Emission

Standards (indicated on the underhood emission

control label), it is designed to operate on fuels that meet

California specifications. If such fuels are not available in

states adopting California emissions standards, your

vehicle will operate satisfactorily on fuels meeting federal

specifications, but emission control system performance

may be affected.

The malfunction indicator lamp on your instrument panel

may turn on and/or your vehicle may fail a smog

-check

test. See “Malfunction Indicator Lamp” in the Index.

If this occurs, return to your authorized Oldsmobile dealer

for diagnosis to determine the cause of failure. In the event

it is determined that the cause of the condition is the

type of fuels used, repairs may not be covered by

your warranty.

Some gasolines that are not reformulated for low

emissions may contain an octane-enhancing additive called

methylcyclopentadienyl manganese tricarbonyl (MMT);

ask your service station operator whether or not the fuel

contains MMT. General Motors does not recommend the

use of such gasolines. If fuels containing MMT are used,

spark plug life may be reduced and your emission control

system performance may be affected. The malfunction

indicator lamp on your instrument panel may turn on. If

this occurs, return to your authorized Oldsmobile dealer

for service.

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Oldsmobile 2001 Alero User Manual Page 242