Pontiac 2006 Gto User Manual download pdf (Page 195)

Adding Equipment to the Outside of

Your Vehicle

Things you might add to the outside of your vehicle can

affect the airﬂow around it. This may cause wind

noise and affect windshield washer performance. Check

with your dealer before adding equipment to the

outside of your vehicle.

Fuel

Use of the recommended fuel is an important part of the

proper maintenance of your vehicle.

Gasoline Octane

Use premium unleaded gasoline with a posted octane

rating of 91 or higher. You may also use regular unleaded

gasoline rated at 87 octane or higher, but your vehicle’s

acceleration may be slightly reduced, and you may notice

a slight audible knocking noise, commonly referred to as

spark knock. If the octane is less than 87, you may notice

a heavy knocking noise when you drive. If this occurs,

use a gasoline rated at 87 octane or higher as soon as

possible. Otherwise, you might damage your engine. If

you are using gasoline rated at 87 octane or higher and

you hear heavy knocking, your engine needs service.

Gasoline Speciﬁcations

At a minimum, gasoline should meet ASTM speciﬁcation

D 4814 in the United States or CAN/CGSB-3.5 in

Canada. Some gasolines may contain an

octane-enhancing additive called methylcyclopentadienyl

manganese tricarbonyl (MMT). General Motors

recommends against the use of gasolines containing

MMT. See

Additives on page 5-6

for additional

information.

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2006 - Pontiac GTO Owner Manual

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Pontiac 2006 Gto User Manual Page 195