2004 BMW 645CI COUPE Engine

Refueling
162
Refueling
Always switch off the engine before
refueling. If you do not, fuel cannot be
filled into the tank and a message on the
Control Display will appear.<
Always observe all applicable precau-
tions and regulations when handling
fuels. Never carry spare fuel containers in
your vehicle. Whether empty or full, these
containers can leak, cause an explosion,
and lead to fire in the event of a collision.<
Fuel filler door
To open and close: briefly press the rear
edge of the fuel filler door.
Manual release
In the event of an electrical malfunction in
the system, you can release the fuel filler
door manually:
In the luggage compartment, pull the knob
with the gas pump symbol on the right side
panel.
Observe following when refueling
When handling fuels always observe
any safety guidelines posted at the
filling station.<
Put the fuel filler cap in the bracket
attached to the fuel filler door.
When refueling, insert the filler nozzle com-
pletely into the filler pipe. Lifting the filler
nozzle during refueling
>results in premature pump shutoff
>can lead to reduced efficiency in the
fuel-vapor recovery system.
The fuel tank is full when the filler nozzle
clicks off the first time.
Fuel tank capacity
Approx. 18.5 US gallons/70 liters, including
the reserve capacity of approx. 2.1 gallons/
8 liters.
Refuel as soon as possible once your
cruising range falls below 30 miles/
50 km, as otherwise engine functions are
not ensured and damage can occur.<
Closing fuel filler cap
Fit the cap and turn it clockwise until you
clearly hear a click.
Close the fuel filler cap carefully after
refueling, continuing until a click is
heard. While closing, be sure not to
squeeze the strap which is fastened to the
cap. A loose or missing cap will activate the
message Check Gas Cap
* on the Control
Display.<

Mobility
163Reference
At a glance
Controls
Driving tips
Communications
Navigation
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Warning lamp* lights up.
Fuel filler cap is not properly closed
or is missing. Check whether the
fuel filler cap is properly closed.
Fuel specifications
The engine uses lead-free gasoline only.
Required fuel
Premium Unleaded Gasoline,
Minimum Octane Rating: 91.
Minimum Octane Rating corresponds to
the Anti Knock Index AKI and is deter-
mined according to the so-called (R+M)/
2 method.
Do not use leaded gasoline, as other-
wise the lambda probe and catalytic
converter will be permanently damaged.<
Use high-quality brands
Field experience has indicated significant
differences in fuel quality: volatility, compo-
sition, additives, etc., among gasolines
offered for sale in the United States and
Canada. Fuels containing up to and includ-
ing 10 % ethanol or other oxygenates with
up to 2.8 % oxygen by weight, that is,
15 % MTBE or 3 % methanol plus an equiv-
alent amount of co-solvent, will not void
the applicable warranties with respect to
defects in materials or workmanship.
The use of poor-quality fuels may
result in drivability, starting and stall-
ing problems, especially under certain
environmental conditions such as high
ambient temperature and high altitude.
Should you encounter drivability problems
which you suspect could be related to the
fuel you are using, we recommend that you
respond by switching to a recognized high-
quality brand.
Failure to comply with these recommenda-
tions may also result in unscheduled main-
tenance.<

Under the hood
170
Under the hood
Never attempt to perform any service
or repair operations on your vehicle
without the required, professional technical
training. If you are unfamiliar with the ser-
vice procedures and precautions, always
have any required work on your vehicle
carried out at your BMW center. If this work
is performed inexpertly, there is a danger of
damage and associated safety risks.<
Hood
Releasing
Pull the lever located under the left side of
the instrument panel.
Opening
Press the release handle and open the
engine hood.
Closing
Close the hood from a height of approx.
16 in/40 cm with momentum. It must be
clearly heard to engage.
Make sure that the closing path of the
engine hood is clear, as otherwise
injuries may result.
If you see any signs that the hood is not
completely closed while you are driving
your vehicle, you should stop at once and
close it securely.<

Mobility
171Reference
At a glance
Controls
Driving tips
Communications
Navigation
Entertainment
Engine compartment
1Filler neck for engine oil, refer to
Topping up engine oil
2Brake fluid reservoir, located beneath
the microfilter cover, refer to page 173
3Dipstick for engine oil, refer to
Checking oil level
4Starting-aid terminal, refer to page 184
5Washer fluid reservoir of the headlamp
and windshield cleaning systems, refer
to page 62
6Expansion tank for coolant, refer to
page 172
Engine oil
Checking oil level
1.Park the vehicle on a level surface with
the engine at operating temperature
2.After approx. 5 minutes, pull the
dipstick 3 out and wipe it off with a
clean lint-free cloth, paper towel, or
similar material3.Carefully push the dipstick all the way
into the guide tube and pull it out again
4.The oil should extend to between the
two marks on the dipstick.
The engine oil consumption is dependent
on driving style and driving conditions.
The oil quantity between the centers of the
two marks on the dipstick, refer to arrows,
is approx. 1.6 US quarts/1.5 liters. Do not
fill beyond the upper mark on the dipstick.
Excess oil can damage the engine.

Under the hood
172
Topping up engine oil
Wait until the level has dropped to just on
the lower dipstick mark before adding oil.
In this area a message also appears on the
Control Display.
Store oil, grease etc., well out of the
reach of children; always observe all
warning labels on the containers.<
Specified engine oils
The quality of the engine oil selected has
critical significance for the operation and
service life of an engine. BMW continu-
ously approves specific oils after confirm-
ing their suitability for use in its vehicles
with extensive testing.
Use only approved BMW High Perfor-
mance Synthetic Oil.
If you are unable to obtain BMW High Per-
formance Synthetic Oil, you can add small
amounts of another synthetic oil between
oil changes. Use only oils with the API SH
specification or higher.
Ask your BMW center for details con-
cerning the specific BMW High Per-
formance Synthetic Oil or synthetic oils
which have been approved.<
You can also call BMW of North America
at 1-800-831-1117 or visit this website:
www.bmwusa.com to obtain this informa-
tion.
BMW engines are designed to oper-
ate without additives, and their use
could even lead to damage in some
cases.<
Viscosity ratings
Viscosity is the oil flow rating as defined in
SAE classes.
The selection of the correct SAE class
depends on the climatic conditions in the
area where you typically drive your BMW.
Approved oils are in SAE classes
5W-40 and 5W-30.<
These oils may be used for driving in all
ambient temperatures.
Coolant
Do not add coolant to the cooling sys-
tem when the engine is hot. Escaping
coolant can cause burns.<
Coolant consists of water and the addition
of antifreeze and anticorrosion agent. Not
all commercially available additives are
suitable for your BMW. Ask your BMW cen-
ter for suitable additives.
Only use suitable additives, as other-
wise engine damage may result. The
additives present a health hazard; observe
the instructions on the containers.<
Always observe all applicable envi-
ronmental rules and regulations when
disposing of used coolant additives.<
Checking coolant level
1.The engine must be at ambient temper-
ature
2.Turn the cap of the expansion tank
counterclockwise to allow any accumu-
lated pressure to escape, then continue
turning to open

Maintenance
174
Maintenance
The BMW maintenance
system
The BMW maintenance system supports
the preservation of the traffic and operating
safety of your BMW. The service schedule
also includes operations related to the
vehicle's comfort and convenience fea-
tures, such as replacement of the filters for
the inside air. The ultimate objective is to
ensure economical maintenance by provid-
ing the ideal service for your vehicle.
Should the day come when you decide to
sell your BMW, you will find that a complete
dealer service history is an asset of inesti-
mable value.
CBS Condition Based Service
Sensors and special algorithms take the
different driving conditions of your BMW
into account. Condition Based Service
uses this to determine the current and
future maintenance requirement. By letting
you define a service and maintenance reg-
imen that reflects your own individual
requirements, the system builds the basis
for trouble-free driving.
The service requirement display, refer to
page 65, individually displays the time or
distance remaining for selected mainte-
nance work and any legally required inter-
vals:
>Engine oil
>Brakes, front and rear separately
>Microfilter/activated-charcoal filter>Brake fluid
>Spark plugs
>Vehicle check
>Legally required tests depending on
local regulations.
Your vehicle stores this information contin-
uously in the master key while the vehicle is
being driven. After accessing the data
stored in the master key, your BMW Ser-
vice Advisor can suggest precisely the right
array of service procedures for your own
individual vehicle. You should therefore
hand over to the BMW Service Advisor the
key you last used to drive when you take
your vehicle for service.
Make sure the date in the Control
Center is always set correctly, refer to
page 74, as otherwise the effectiveness of
CBS Condition Based Service is not
ensured.<
Service and Warranty Information
Booklet for US models and Warranty
and Service Guide Booklet for
Canadian models
Please consult your Service and Warranty
Information Booklet for US models and
Warranty and Service Guide Booklet for
Canadian models for additional information
on service requirements.
Have service and repair operations
performed at your BMW center.
Take the time to ensure that these service
procedures are confirmed by entries in
your vehicle's Service and Warranty Infor-
mation Booklet for US models and War-
ranty and Service Guide Booklet for Cana-
dian models. These entries verify that your
vehicle has received the specified regular
maintenance, and may also be required
when submitting warranty claims.<

Rules and regulations
176
Rules and regulations
California laws
Proposition 65 Warning
California laws require us to issue the fol-
lowing warning:
Engine exhaust and a wide variety of
automobile components and parts,
including components found in the interior
furnishings in a vehicle, contain or emit
chemicals known to the State of California
to cause cancer and birth defects and
reproductive harm. In addition, certain flu-
ids contained in vehicles and certain prod-
ucts of component wear contain or emit
chemicals known to the State of California
to cause cancer and birth defects or other
reproductive harm.
Battery posts, terminals and related acces-
sories contain lead and lead compounds.
Wash your hands after handling.
Used engine oil contains chemicals that
have caused cancer in laboratory animals.
Always protect your skin by washing thor-
oughly with soap and water.<
Event Data Recorders
Your vehicle may be equipped with one or
more sensing and diagnostic modules or a
recording device capable of recording or
transmitting certain vehicle data or infor-
mation. In addition, if you have a Subscrip-
tion Service Agreement for the BMW Assist
system, certain vehicle information may be
transmitted or recorded in order to provide
such services.
OBD connector
The Onboard Diagnostic OBD interface
socket is located on the left of the driver's
side under the instrument panel and under
a cover.
The cover has the letters OBD on it.
The purpose of the OBD system is to
ensure proper operation of the emission
control system for the vehicle's lifetime.
The system monitors emission-related
components and systems for deterioration
and malfunction.
An illuminated indicator lamp
informs you of the need for service,
not of the need to stop the vehicle.
However, the systems should be checked
by your BMW center at the earliest possible
opportunity.
Display of the previously described
malfunction on Canadian models.
Under certain conditions, the indicator
lamp will blink or flash. This indicates a
rather severe level of engine misfire. When
this occurs, you should reduce speed and
consult the nearest BMW center as soon as
possible. Severe engine misfire over only a
short period of time can seriously damage
emissions control components, especially
the catalytic converter.

Mobility
179Reference
At a glance
Controls
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High beams, parking lamps
The illustration shows the front left side of
the engine compartment.
High beams
Bulb 55 watts, H 7
1.Remove the cover cap 1 by pressing
the tab and removing the cover cap
upward
2.Press the bulb holder from above to
release it
3.Remove the bulb holder
4.Remove and replace the bulb.
Parking lamps
Bulb 10 watts
Bulb holder and reflector are one unit
and are replaced together.<
1.Turn the bulb holder 2 to the right and
remove
2.Press the detent on the plug connector,
pull off the bulb holder and replace.
Front turn signal, sidemarker
Your BMW is equipped with two turn signal
lamps per side in the front. Turn signal
lamp 1 can be replaced via the engine
compartment, and turn signal lamp 2 via
the wheel well.
Turn signal lamp 1
Bulb 21 watts, WY 21 SV
The illustration shows the front right side of
the engine compartment.
1.The lever shown:
>Right turn signal: press downwards
>Left turn signal: press upwards
2.Remove the bulb holder towards the
rear
3.Remove and replace the bulb.
Turn signal lamp 2
Bulb 21 watts, WY 21 SV
The bulb of the turn signal lamp 2 can be
replaced via a cover at the front of the
wheel well.
The illustration shows the left side of the
vehicle.
1.Turn the steering all the way to lock to
obtain access to the cover, refer to
illustration
2.Remove the cover by unscrewing the
two bolts with an open-end wrench
from the onboard tool kit
3.Location of the bulb holder of turn sig-
nal lamp 2, refer to arrow