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Checking
and Filling
Gasoline
Fuel supply
Applies to: vehicles with gasoline engine
Using the right fuel helps keep the environment
clean and prevents engine damage .
Fuel reco mm e ndati o n
The fuel recommended for your vehicle is unlead-
ed pre mium grade gasoline. Audi recommends
using TOP TIER Detergent Gasoline with a mini-
mum octane rating of 91 AKI (95 RON). For more
information on TOP TIER Detergent Gasoline,
please go to the official website
(www.toptiergas .com) .
The recommended gasoline octane rating for
your engine can also be found on a label located
on the inside of the fuel filler flap . This rating
may be spec ified as AKI or RON.
Your vehicle may also be operated using unlead-
ed regular gasoline with a minimum octane rat -
ing of 87 AKl/91 RON . However, using 87 AKl/91
RON octane fuel will slightly reduce engine per-
formance.
Use unleade d gas oline only. Unleaded gasoline
is available throughout the USA, Canada, and in
most European count ries . We recommend that
you do not ta ke your vehicle to areas or countries
where unleaded gasol ine may not be availab le.
For more information on refueling your vehicle,
see
~ page 193 .
Octane rating
Octane rating indicates a gasoline's ability to re-
sist engine damaging "knock" caused by prema-
ture ignit ion and detonation . Therefore , buying
the correct grade of gasoline is very important to
help prevent poss ible engine damage and a loss
of eng ine performance.
Gasoline most commonly used in the United
States and Canada has the following octane rat-
ings that can usually be found on the filler pump:
- Premium Grade: 91 - 96 AKI
Ch e c k ing an d Filling
- Regular Grade: 87 - 90 AK I
Explanation of the abb reviations:
AK I=
Anti
Knock Index = (R+M)/2 = (RON +MON)/
2
RON = Research Octane Number
MON= Moto r Oct ane Number.
(D
Note
- Do not use any fue l with octane ratings low-
er than 87 AKI or 91 RON otherwise expen-
sive engine damage will occur .
- Do not use leaded gasoline. The use of lead-
ed gasoline will severe ly damage your vehi-
cle's catalytic converter and its ability to
control exhaust emissions .
Blended gasoline
Applies to: vehicles with gasoline engine
Use of g as o lin e con t ainin g alcoh ol o r MTBE
(meth yl t e rt iary but y l ether )
You may use unleaded gasoline blended with al-
cohol or MTB E (commonly referred to as oxygen-
ates) if the blended mixture meets the follow ing
criteria:
Blend of g asolin e met hanol (wood alcohol or
methyl alcoho l)
- Anti-knock index must be 87 AKI or higher.
- Blend must contain no more than 3% metha-
nol.
- Blend must contain more than 2% co-solvents.
Blend of gasoline and ethanol (g rain alcohol or
ethyl alcohol)
- Anti-knock index must be 87 AKI or higher .
- Blend must not conta in more than 15% etha-
nol.
Ble nd of gasoline and MTBE
- Anti-knock index must be 87 AK I or higher.
- Blend must contain not more than 15% MTBE.
Se asonall y adjust ed gasoline
Many gasoline grades are blended to perform es-
pecially well for winter or summer driving. Dur-
ing seasonal change-over, we suggest that you
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