Checking And Filling; Gasoline - Audi A8 2018 Owner's Manual

Checking and Filling
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 recommendation
The fuel recommended for your vehicle is unlead-
ed premium grade gasoline . Audi recommends
using TOP TIER Detergent Gasoline with a mini-
mum octane rating of91 AKI (95 RON). For more
information on TOP TIER Detergent Gasoline,
please go to the official website
(www.toptiergas .com).
The recommended gasoline octane rat ing for
your engine can also be found on a label located
on the inside of the fuel filler flap . This rating
may be specified as AK I or RON .
Your veh icle may also be operated using unlead-
ed regular gasoline with a minimum octane rat -
ing of 87 AKl/91 RON. However, using 87 AKI/91
RON octane fuel will slightly reduce engine per-
formance.
Use unleaded gasoline only. Unleaded gasoline
is available throughout the USA , Canada, and in
most European countries . We recommend that
you do not take your veh icle to areas or count ries
where unleaded gasoline may not be available.
For more information on refueling your vehicle,
see
~
page 269 .
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 possible 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
268
- Regular Grade: 87 - 90 AK I
Explanation of the abb reviations :
AKI = Anti Knock I ndex = (R+M)/2 = (RON +MON)/
2
RON = Research Octane Number
MON= Motor Octane Number.
@
Note
- Do not use any fuel with octane ratin gs 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 severely damage your vehi-
cle's catalytic converter and its ability to
contro l exhaust emissions .
Blended gasoline
Applies to: vehicles with gasoline engine
Use of gasoline containing alcohol or MTBE
(methyl tertiary butyl 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 gasoline methanol (wood alcohol or
methyl alcohol)
- 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 (grain alcohol or
ethyl alcohol)
- Anti-knock index must be 87 AKI or higher .
- Blend must not conta in more than 15% etha-
nol.
Blend of gasoline and MTBE
- Anti-knock index must be 87 AK I or higher.
- Blend must not contain more t han 15% MTBE.
Seasonally adjusted 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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