2004 BMW 3 SERIES coolant temperature

Maintenance System
The BMW Maintenance System has been
devised with the following objectives: to
maximize vehicle safety, reliability, and resale
value by minimizing breakdowns resulting from
wear, and minimizing cost and inconvenience
by computing maintenance intervals based
upon the specific manner in which each
individual vehicle is driven.
Maintenance intervals on motor vehicles have
conventionally been specified based upon
accumulated mileage. However, the type of
driving conditions has a major influence on
routine maintenance requirements; distance
traveled is only one of the significant factors.
A vehicle driven for 50,000 miles of short trips
in the city with numerous cold starts, pro-
longed periods of idling, stop-and-go driving,
and high engine speeds during acceleration
requires more frequent maintenance
intervals than a vehicle driven for 50,000
miles for long distances at low engine
speeds primarily at operating temperature.
The advanced technologies at BMW have led
to the development of the unique BMW service
interval indicator which computes the actual
optimum maintenance requirements based
not only upon the accumulated mileage, but
taking into account important factors such as
engine coolant temperatures, high or low
engine speeds, short or long trip driving, and
number of vehicle starts. The maintenance
interval may therefore be maximized with
considerable savings to owners of vehicles
subjected to light duty.
The service interval indicator consists of a
mileage reading, and the inscriptions “OIL
SERVICE” and “INSPECTION”.
Whenever the ignition is switched on, the
display shows the next scheduled type of
service and the remaining distance until the
service should be performed. The distance is
based on your driving style.If the maintenance interval has been ex-
ceeded, a “—” symbol reminds you of the
urgent need for servicing. In the interests of
road safety and reliability, you should avoid
driving your BMW when the “—” symbol is
showing, and have the essential maintenance
work performed without delay.
After each maintenance is performed the service
indicator is reset in order to compute the next
service interval.
If the service interval indicator displays an
illogical reading, or if there is no display, consult
a BMW center.
If the speedometer, tachometer or coolant
temperature gauge should develop a fault, the
service interval indicator will probably cease to
operate correctly as well, since it depends on
correct speed, distance and temperature
readings. The fault must be located and rectified
by a BMW center.
A detailed list of all maintenance operations
included in each of the elements of the BMW
Maintenance System is found on pages 5-8.
These elements are as follows:
Quality Certification I will be performed by your
selling center and certified on page 4.
2

3 The performance of certain subsequent
maintenance elements, as required by the
BMW New Vehicle Limited Warranty, will be
specified at intervals computed by the BMW
service interval indicator as follows:
– Oil Service: Engine oil changed with the
engine at operating temperature. Note:
change oil at least once a year. Your BMW is
factory-equipped with a newly-developed
synthetic engine oil. At the time of the
printing of this booklet BMW High-Perfor-
mance Synthetic 5W-30 Oil (Part Number
07 51 0 017 866) and Mobil 1 5W-30 and
5W-40 oils are strongly recommended and
approved by BMW for the 325ci and 330ci
models. BMW is evaluating various
synthetic oils for inclusion in our list of
recommended motor oils.
For the most current list of synthetic oils,
please contact your BMW center, or call
BMW of North America at 1-800-831-1117.
You can also obtain this information from
our website, www.bmwusa.com/.
It is recommended to check engine oil level
whenever fuel is added to the vehicle.
If you need to add oil between oil changes
and are unable to obtain BMW High
Performance Synthetic Oil, Mobil 1 or
another special oil on the list, use a
synthetic oil with an API rating of SJ or
higher.
– Inspection I: Major vehicle maintenance
as specified in the following pages under
Inspection I.
– Inspection II: Additional major vehicle
maintenance as specified in the following
pages under Inspection II.
The following maintenance elements must
be performed at the mileage/time stated
(time intervals begin from the vehicle’s
production date):
– Brake Fluid Service: Change brake fluid
every two years.– Oxygen Sensor Service: The oxygen sensor
deteriorates strictly on a mileage basis and
must therefore be replaced every 120,000
miles to maximize vehicle fuel economy
and minimize exhaust pollution. The
replacement of the oxygen sensor is
required under the terms of the appli-
cable BMW emission system warranties.
– Spark Plug Service: Replace spark plugs
every 100,000 miles. Your BMW is
equipped with platinum-tipped spark plugs.
These allow a longer service life than
conventional spark plugs.
– Automatic Transmission Service: Change
ATF every 100,000 miles.
The engine coolant has a lifetime rating and
does not need to be changed.
For your convenience, you may also wish to
have your BMW center perform any necessary
operations to fulfill any state inspection
requirements in your area concurrent with the
maintenance elements specified above during
other repairs.
Make sure that confirmation of maintenance
work is always entered in this Service and
Warranty Information Statement. You may need
this for any warranty claims that become
necessary, and later on as evidence that your
car has been given the correct and regular
maintenance that justifies its resale or trade-in
value.
BMW has applied the most modern techno-
logical advances not only to the design and
production of your vehicle, but also to comput-
ing of the optimum maintenance interval for
your type of operations and driving style. Your
BMW center has made a substantial invest-
ment in unique BMW special service tools to
enable his BMW factory trained service
technicians to perform quality repairs on your
BMW in minimal time. He/she looks forward to
serving your every service need and to help
maximize your satisfaction with your BMW, its
longevity, and resale value.

63 Con-
Series vertible
Change oil and oil filter while engine is at normal operating temperature.  
We recommend BMW 5W-30 High Performance Synthetic Oil,
p/n 07 51 0 017 866.
Check transmission for leaks.  
Check rear axle for leaks.  
Half-shafts: Check for leaks at flexible boots.  
Visually check fuel tank, lines and connections for leaks.  
Check condition, position, and mounting of exhaust system.  
Examine for leaks.
Check power steering system for leaks. Check power steering fluid level;  
add fluid if necessary.
Check steering for absence of play, condition of suspension track rods,  
front axle joints, steering linkage and joint disc.
Check overall thickness of front and rear disc brake pads using special tool.  
If replacement is necessary: Examine brake disc surfaces. Clean brake pad
contact points in calipers. Grease wheel centering hubs. Check thickness
of parking brake linings only when replacing rear brake pads.
Check brake system connections and lines for leaks, damage  
and incorrect positioning.
Check parking brake actuation. Adjust if necessary.  
Check all tire pressures (including spare). Correct if necessary.  
Check condition of tires (outer surface [left/right]), tread wear and pattern;
in case of uneven tread wear, readjust wheel alignment if requested
(invoice separately).
Inspect entire body according to terms of rust performation limited warranty.  
(Must be performed at least every two years).
Engine Compartment
Read out diagnostic system.  
Check engine cooling system/heater hose connections for leaks.  
Check coolant level and antifreeze protection level. Add coolant if required.
Check windshield washer fluid level and antifreeze protection.  
Fill up and/or correct if required.
Check air conditioner for operation.  
Replace microfilter. (Note: reduce replacement interval in dusty  
operating conditions.)
Reset service interval indicator.
Inspection I
Only those items of inspection work which apply to your vehicle will be performed. This list is
subject to amendment.
Undercarriage