2005 PORSCHE 911 CARRERA octane

4Fuel QualityYour 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 Oktane™ knock control“ will adapt the ignition timing, if necessary.Fuels containing alcohol and etherSome 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 ethanol) 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, to change to a different 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 MMTSome North American fuels contain an octane enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT).
If such fuels are used, your emission 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.

Maintenance, Car Care
187
Fuel Economy Fuel economy will vary depending on where,
when and how you drive, optional equipment
installed, and the general condition of your
car.
A car tuned to specifications and correctly
maintained, will help you to achieve optimal
fuel economy.
fHave your vehicle tuned to specifications.
Air cleaner should be dirt free to allow proper
engine “breathing”.
Battery should be fully charged.
Wheels should be properly aligned.
Tires should be inflated at correct pressure.
fAlways monitor your fuel consumption.
fDrive smoothly, avoid abrupt changes in speed
as much as possible.
fAvoid jack rabbit starts and sudden stops.
fDo not drive longer than necessary in the lower
gears. Shifting into a higher gear early without
lugging the engine will help save fuel.
fProlonged “warm up” idling wastes gas. Start
the vehicle just before you are ready to drive.
Accelerate slowly and smoothly.
fSwitch off the engine if stationary for longer
periods. fAny additional weight carried in the vehicle re-
duces fuel economy. Always keep cargo to a
minimum and remove all unnecessary items.
fOrganize your trips to take in several errands
in one trip.
fAll electrical accessories contribute to in-
creased fuel consumption.
fOnly switch on the air conditioning when neces-
sary.
fDo not drive with the Roof Transport System
mounted unless you need it.
The EPA estimated m.p.g. is to be used for
comparison purposes, actual mileage may
be different from the estimated m.p.g.,
depending on your driving speed, weather
conditions and trip length. Your actual
highway mileage will probably be less than
the estimated m.p.g.
fPlease observe all local and national speed
limits.
Operating Your Porsche in other
Countries Government regulations in the United States and
Canada require that automobiles meet specific
emission regulations and safety standards. There-
fore, cars built for the U.S. and Canada differ from
vehicles sold in other countries.
If you plan to take your Porsche outside the conti-
nental limits of the United States or Canada, there
is the possibility that
– unleaded fuel may not be available;
– unleaded fuel may have a considerably lower
octane rating. Excessive engine knock and se-
rious damage to both engine and catalytic con-
verters could result;
– service may be inadequate due to lack of prop-
er service facilities, tools or diagnostic equip-
ment;
– replacement parts may not be available or very
difficult to get.
Porsche cannot be responsible for the
mechanical damage that could result
because of inadequate fuel, service or parts
availability.
If you purchased your Porsche abroad and want to
bring it back home, be sure to find out about ship-
ping and forwarding requirements, as well as cur-
rent import and customs regulations.

Maintenance, Car Care
189
Refuelling Fuel tank capacity is listed under “Capacities”.
Porsche does not recommend the use of fuel ad-
ditives.
Fuel is highly flammable and harmful to
health.
fPlease observe the chapter “CAPACITIES” on
Page 268.1.Important: Stop the engine and switch off the
ignition.
2. Slowly unscrew the tank cap.
Hang the tank cap on the plastic strap of the
filler flap.
3. Insert fuel-hose nozzle fully into the filler neck
with the handle of the fuel-hose nozzle facing
down.
4. Do not add further fuel once the correctly op-
erated automatic fuel-hose nozzle has
switched off.
Fuel could spray or could run over in warm
temperatures.
5. Replace the tank cap immediately after
refuelling and turn it until you hear it and feel it
engage.
If you lose the tank cap, you must replace it
only with an original part to reduce the
possibility of a fire in the event of a collision.
Note
The oil level is automatically measured during
refuelling.
fPlease observe the chapter “OIL DISPLAY AND
MEASUREMENT OF THE ENGINE OIL LEVEL”
on Page 101.
Fuel Recommendations Your Porsche is equipped with catalytic convert-
ers and must use UNLEADED FUEL ONLY.
Your engine is designed to provide optimum per-
formance and fuel economy using unleaded premi-
um fuel with an octane rating of 98 RON
(93
CLC or AKI). Porsche therefore recom-
mends 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
Oktane™ knock control” will adapt the ignition tim-
ing, if necessary.
The use of UNLEADED FUEL ONLY is critically
important to the life of the catalytic
converters. Deposits from leaded fuels will
ruin the converters and make it ineffective
as an emission control device.
Cars with catalytic converters 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.

190
Maintenance, Car Care Unleaded fuels may not be available outside the
continental U.S. and Canada. Therefore, we rec-
ommend you do not take your car to areas or
countries where unleaded fuel may not be availa-
ble.
Octane ratings Octane rating indicates a fuel’s ability to resist det-
onation. 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 oc-
tane rating) or AKI (antiknock index) octane rating
usually displayed on U.S. fuel pumps is calculated
as research octane number plus motor octane
number, divided by 2, that is written as:
The CLC or AKI octane rating is usually lower than
the RON rating:
For example: 95 RON equals 90 CLC or AKI
Fuels containing alcohol and ether Some areas of the U.S. require oxygenated fuels
during certain portions of the year. Oxygenated fu-
els are fuels which contain alcohols (such as meth-
anol or ethanol) 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, to change to a
different fuel or station if any of the following prob-
lems 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 en-
hancing additive called methylcyclopentadienyl
manganese tricarbonyl (MMT).
If such fuels are used, your emission control sys-
tem performance may be negatively affected.
The check engine warning light on your instrument
panel may turn on.
If this occurs, Porsche recommends you stop us-
ing fuels containing MMT.Portable Fuel Containers
Danger!
Portable fuel containers, full or partially
empty, may leak causing an explosion, or re-
sult in fire in case of an accident.
fNever carry additional fuel in portable contain-ers in your vehicle. RON+MON
2R+M
2 or

268
Technical Data
CapacitiesUse only fluids and fuels authorized by Porsche. Your authorized Porsche dealer will gladly advise you.
Your Porsche has been designed so that it is not necessary to mix any additives with oils or fuels.
Engine 911 Carrera: Oil change quantity without oil filter approx. 8.5 quarts / 8.0 liters
911 Carrera: Oil change quantity with oil filter approx. 8.7 quarts / 8.25 liters
911 Carrera S: Oil change quantity without oil filter approx. 8.7 quarts / 8.25 liters
911 Carrera S: Oil change quantity with oil filter approx. 9 quarts / 8.5 liters
Please observe the chapter “ENGINE OIL” on Page 181.
Coolantapprox. 8.45 U.S. gallons / 32 liters
Manual transmission
and differential
approx. 3.1 quarts / 2.9 liters transmission oil
Tiptronic Sapprox. 9.5 quarts / 9 liters ATF
Differential for Tiptronic Sapprox. 1.3 quarts / 1.2 liter
Fuel tank approx. 16.9 U.S. gallons / 64 liters
Fuel qualityYour 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 Oktane™ knock control” will adapt the ignition timing, if necessary.
Power steeringapprox. 1.35 quarts / 1.27 liter hydraulic fluid Pentosin CHF 11 S
®
Brake fluid0.48 quarts / 0.45 liters; use only Original Porsche brake fluid.
Windshield washerapprox. 2.6 quarts/2,5 liters without headlight washer
approx. 6.3 quarts/6 liters with headlight washer

280
Index
HHandbrake ................................................... 58
Hardtop ..................................................... 169
Headlights ..........................................114
, 246
Adjusting ....................................257, 258
Cleaning system ................ 115
, 193
, 268
Headlights beam adjustment........................ 114
Heated rear window ...................................... 33
Heater ....................................................... 120
High beam
Indicator light........................................ 83
Lever ................................................. 113
Home mode ............................................... 113
HomeLink................................................... 136
Hoods................................................130, 131
Horn ............................................... 17
, 22, 24
IIgnition lock.................................................. 72
Immobilizer .................................................. 19
Indicator lights.............................................. 76
Instrument.................................................... 76
Illumination ........................................... 80
Lights ................................................ 113
Panel ...........................................70
, 105
Interior lights ................................................ 69
Interior mirror .........................................30, 32
JJumper cables ....................................215
, 242
KKeys ..................................................... 19
, 20
LLATCH System .............................................. 48
Leather care ............................................... 205
License plate light .............................. 113
, 255
Lids ........................................................... 131
Emergency unlocking .......................... 235
Lifting/sliding roof ....................................... 152
Light
Flasher ................................ 83
, 113
, 114
Low beam ................................. 113, 114
Sensor for instrument illumination........... 76
Switch ....................................... 113, 114
Light alloy wheels
Inscription .......................................... 221
Load switch-off ........................................... 233
Loading information .................................... 222
Locking ........................................................ 22
Conditions ............................................ 24
Lowering ...................................................... 52
Luggage carrier .......................................... 269
Luggage compartment ................................ 132
Lid ..................................................... 130
Lid warning light.................................. 130
Light .................................................. 255
Luggage compartment/
engine compartment lid, warning lights ......... 130
Luggage rack ............................................. 175
MMaintenance ...............................................178
Make-up mirror .............................................41
Maximum permitted engine speeds ....... 16
, 144
Mirrors ............................................ 30
, 32, 55
Anti-glare ..............................................32
Multi-functional steering wheel ........................40
NNavigation ..................................................139
Notes on
Car care .............................................198
Maintenance .......................................178
Number plate light.............................. 113
, 255
OOctane rating ..................................... 189
, 190
Off delay ....................................................113
Oil..............................................................181
Checking level.....................................101
Consumption.........................................16
Level checks.......................................181
Level indicator ....................................101
Pressure...............................................88
Temperature .........................................80
On-board computer .......................................90
Basic settings .....................................103
Language versions ..............................103
On-board literature ..........................................2
Orientation light ............................................69
Outside temperatur indicator..........................87