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Fuel Recommendat ions
Your Porsche is equipped with catalytic converters
and must use UNLEADED FUEL ONLY.
Your engine is d esigned to provide optimum
performance and fuel economy using unleaded
premium fuel with an oct ane rating of 98 RON
(93 CLC or AKI). Porsche therefore recommends
the use of these fuels in your vehicle.
Porsche also recognizes that these fuels may not
always be available. Be assured that your vehicle
will operate properly on unleaded premium fuels
with octane numbers of at least 95 RON (90 CLC
or AKI), since the engine’s ”Electronic Octane™
knock control“ will adapt the i gnition timing, if
necessary.
The use of UNLEADED FUEL ONLY is critical ly
important to the life of the catalytic convert-
ers. Deposits from leaded fuels will ruin the
converters and make it ineffe ctive as an emis-
sion control device.
Cars with catalytic conve rters have a smaller fuel
tank opening, and gas station pumps have smaller
nozzles. This will prevent accidental pumping of
leaded fuel into cars with catalytic converters.
Unleaded fuels may not be available outside the
contin ental U.S. and Canada. Therefore, we
recommend you do not take your car to areas
or countries where unleaded fuel may not be
available.
Octane ratings
Octane rating indicates a fuel’s ability to resist
detonation. Therefore, buying the correct octane
gas is important to prevent engine ”damage“.
The RON octane rating is based on the research
method . The CLC (U.S. Cost of Living Council
octan e rating ) or AKI (antiknock inde x) octane
rating usually displayed on U.S. fuel pumps is
calculated as research octane number plus motor
octane numbe r, div ided by 2, that is writ ten as:
RON + MON
R + M
2
or
2
The CLC or AKI octane rating is usually lower than
the RON rating:
For exampl e: 95 RON equals 90 CLC or AKI.
Fuels c ontaining a lcohol and ether
Some areas of t he U.S. require oxygenated fuels
during certain portions of the year. Oxygenated
fuels are fuels which contain alcohols (such as
methanol or ethanol) or ether (such as MTBE).
Under normal cond itions, the amount of these
compounds in the fuel will n ot affect driveability.
You may use o xygenated fuels in your Porsche,
provided the octane requirements for your vehicle
are met. We recommend, however, to change
to a different fuel or station if any of the followin g
problems occur with your vehicle:
– Deterio ration of driveability and performance.
– Substantially reduced fuel economy.
– Vapor lock and non-start problems, especially
at high altitude or at high temperature.
– Engine malfunction or stalling.
Fuels co ntaining M MT
Some North American fuels contain an octane
enhancing additive called methylc yclopentadienyl
manganese tricarbonyl (MMT).
If such fuels are used, your emission control
syste m performance may be negatively aff ected.
The check engine warning light on your instrume n t
panel may turn on. If this occurs, Porsche recom-
mends you stop using fuels containing MMT.
Maintenance, Car Care
219
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