Porsche 911 Carrera - Manual (Page 7)

Fuel Quality
Your engine is designed to provide optimum performance and fuel economy using unleaded premium fuel with an octane 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 TM knock control“ will adapt the ignition timing, if necessary.
Fuels containing alcohol and ether
Some areas of the U.S. require oxygenated fuels during certain portions of the year. Oxygenated fuels are fuels which contain alcohols (such as methanol or etha-
nol) or ether (such as MTBE).
Under normal conditions, the amount of these compounds in the fuel will not affect driveability.
You may use oxygenated fuels in your Porsche, provided the octane requirements for your vehicle are met. We recommend, however, that you change to a differ-
ent fuel or station if any of the following problems occur with your vehicle:
–
Deterioration 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 containing MMT
Some North American fuels contain an octane enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT). If such fuels are used, your emis-
sion control system performance may be negatively affected. The check engine warning lights on your instrument panel may turn on. If this occurs, Porsche
recommends you stop using fuels containing MMT.
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