Differential seals on BMW e34

	Cost: $30 Difficulty: Time: 3 - 4 hours
If you start to see some oil drops on your driveway that means that your BMW E34 - E32 - E28 is leaking. You have to determine if the leak is coming from the engine, the transmission, the output flange or the differential seals.

Procedure
8 mm hex socket and ratchet 10 mm allen key for the differential drain and fill screws jackstands and oil drain pan 2 new snap rings and 3 flange oil seals Oil seal puller, 2 bottles of Redline gear fluid and syringe.
1. Loosen the rear wheels bolts then place the rear of the car on jack stands. Clean the differential if there is a lot of dirt and oil around. 2. Grab your favorite oil pan and place it under the differential. Locate the drain plug and drain the differential oil.
	3. Take a socket Allen key and remove all the bolts holding the half shaft. To do so, I place the car in 1st gear, loosen a bolt then remove the car from gear, turned the wheel, place the car in 1st gear again, loosen another bolt and so on... 4. once all the bolts are removed, place the half shaft out of the way and secure it with a piece of wire.
4. Pry the drive flange out with a big screw drive or a little pry bar. You have to use a piece of wood for leverage else you might damage the differential. 5. In the picture you can see the seal. To pry it out, you need a seal puller (cheap tool), don't even try with a screwdriver, there is a big chance that you won't be able to remove it...
	5. Once the seal is out, in the picture you can see the snap ring. This is a good thing to change while you are changing the seal. Use a small flat screwdriver and remove it. 6. Install the new snap ring in place. Snap rings failure will make the flange pop out on its own and you will loose a lot of differential fluid.
7. Lubricate the new seal with differential fluid and carefully install it in the differential. You can use a big socket and a small rubber hammer to make sure that the seal is in place. Be careful as you can VERY EASILY damage the seal... It is a good thing to buy an extra seal just in case. 8. Install the drive flange back in place until the snap ring engages. 9. The rest of the installation is reverse of removal. Don't forget to fill up the differential with fresh redline gear oil.
Recheck everything, lower the car and enjoy.

2008 BMW M3 Sedan part 3

The M3's leather steering wheel, with its thumb contours resting firmly in the driver's hands, provides an optimum grip for precise movement of the steering wheel. The spokes within the steering wheel incorporate the remote control buttons for the audio system and mobile phone, as well as the optional MDrive button. An additional auxiliary button may be programmed through the optional BMW iDrive system.

As an option, both the front seats are available with backrest-width adjustment, while the rear seats may be equipped with folding seatbacks which provides the 15.8 cubic foot luggage compartment even greater capacity.

A premium AM/FM/single-disc CD audio system comes standard with an auxiliary input jack. Individual entertainment options include SIRIUS satellite radio, HD radio and a USB-enabled port for control of an Apple iPod or iPhone media player. These three options can be bundled together in the Technology Package, should one choose to have them all together.

For vehicles equipped with Navigation, the comprehensive information and entertainment systems are controlled by the refined BMW iDrive. Selecting the Navigation/iDrive option also brings the performance-oriented, steering-wheel-spoke-mounted Mdrive button.

Safety begins with the body structure and continues inside

Occupant safety begins with the design of the new BMW M3's body structure. Together with defined deformation zones, the use of high-strength steel ensures smooth and direct transmission of forces in a collision and optimum absorption of loads acting on the car. The space available for deformation is also used to avoid any damage to the passenger cell and keep damage to the body itself to a minimum, even in a severe collision.

The electronic restraint systems are tailored to the ultra-strong structure of the body. Six airbags as well as the belt latch tensioners and belt force limiters are activated by the car's central safety electronics as a function of the type and severity of a collision. Sensors located in the center of the car within the B-pillars and in the doors "tell" the safety electronics which component will offer the occupants optimum protection, with the "proper" restraint systems being activated in the event of a collision.

The driver and front passenger are protected by frontal and side airbags housed in the seat backrests. These four airbags are activated in two stages, depending on the severity of the impact. Through its size alone, the curtain head airbag protects the car's occupants on both the front and the outer rear seats. And the risk of leg injury in a head-on collision, finally, is reduced on the driver's side by defined deformation of the footrest.

BMW Ultimate ServiceTM: Providing owners with incredible value and peace of mind

The BMW 1 Series Convertible will feature BMW Ultimate ServiceTM, a suite of services that includes the BMW Maintenance Program (formerly called Full Maintenance), Roadside Assistance and the New Vehicle Limited Warranty. BMW AssistTM with TeleService is part of the optional Premium Package or can be ordered separately as a stand-along option.

BMW Ultimate ServiceTM includes:

The BMW Maintenance Program is the only no-cost maintenance program in the industry that covers wear and tear items like brake pads and rotors for four years or 50,000 miles, whichever comes first. BMW owners pay nothing for all scheduled inspections, oil changes, brake pads, wiper blade inserts and other wear-and-tear items.

BMW Roadside Assistance is one of the industry's most comprehensive plans available. Not only is it no-charge for the first four years, but there is no mileage limit. BMW drivers enjoy the assurance of on-the-road help 24 hours a day, seven days a week, anywhere in the United States, Canada and Puerto Rico. This includes everything from flat tire changes, emergency gasoline and lock-out assistance, to towing, alternative transportation and even trip-interruption benefits. This service also includes valuable trip routing advice.

BMW New Vehicle Limited Warranty: All 2008 BMW passenger vehicles are covered by BMW's excellent Limited Warranty, which includes:

• New-vehicle warranty - four-year/50,000-mile coverage of the vehicle.
• Rust-perforation warranty - 12-year/unlimited-mileage coverage.

BMW AssistTM provides the driver with services that enhance on-the-road security and convenience, for added peace of mind. It is a part of the optional Premium package and can also be ordered separately as a stand-alone option. BMW is the only vehicle manufacturer that offers this service for four years at no additional cost. Most other manufacturers cover only the first year of service.

The in-vehicle equipment for BMW AssistTM includes GPS technology and hands-free communication functions accessed via buttons in the overhead or center console. Vehicle occupants may request emergency or other services simply by pressing a button; the BMW AssistTM system then transmits the location and vehicle information to the BMW AssistTM response center. A response specialist will then speak with the occupants to coordinate dispatch, notify emergency contacts on file, and link BMW Roadside Assistance or emergency services as needed and requested. A severe accident automatically activates the BMW AssistTM call as well. The BMW AssistTM Safety Plan also includes Remote Door Unlock and Stolen Vehicle Recovery services, which can save the owner time and money.

TeleService automatically notifies the BMW center when a vehicle will need service. This feature allows the Service Advisor to proactively set up a customer appointment and have the needed parts ready.

BMW AssistTM subscribers can also enroll in the BMW AssistTM Convenience Plan (available at an additional cost of $199 per year) to avail themselves to many BMW AssistTM Concierge services, from travel planning to dining reservations, shopping assistance and event tickets, as well as receive directions, and traffic and weather information. A selected destination and its phone number can be sent directly to the on-board navigation system and Bluetooth®-linked mobile phone, after a push of the new Concierge button. The Convenience Plan also includes Critical Calling, a new service that connects the driver in case their mobile phone is not in the vehicle or its battery is discharged. After pushing the SOS button, a BMW AssistTM response specialist will link the driver to his requested party for up to five minutes and for up to four events per year.

As before, the BMW AssistTM system includes Bluetooth® hands-free phone connectivity with hands-free phonebook access and dialing by name or number via the steering wheel controls. Use of this feature requires a customer-provided compatible Bluetooth® mobile phone.

Performance with a conscience

BMW strives to produce its motor vehicles and other products with the utmost attention to environmental compatibility and protection. Integrated into the design and development of BMW automobiles are such criteria as resource efficiency and emission control in production; environmentally responsible selection of materials; recyclability during production and within the vehicle; elimination of CFCs and hazardous materials in production; and continuing research into environmentally friendly automotive power sources. Tangible results of these efforts include the recycling of bumper cladding into other vehicle components; water-based paint color coats and powder clear coats; near-future availability of hydrogen-powered models; and various design and engineering elements that help make BMWs easier to dismantle at the end of their service life.

2008 BMW M3 Sedan part 2

Servotronic steering with two manually adjustable control maps

Rear-wheel drive keeps the rack-and-pinion steering of the BMW M3 Sedan free of drive forces. A further enhancement is hydraulic Servotronic power assistance controlling steering forces as a function of road speed. There is also a choice of two different control maps activated through normal and sport modes with a console-mounted button.

In Sport mode the BMW M3 provides direct and immediate response with a relatively high steering effort. In the Normal mode, power assistance is comfort-oriented and requires less steering effort.

Latest-generation of Dynamic Stability Control

The electronic Dynamic Stability Control (DSC) monitors driving conditions and intervenes through the application of brakes and reduced engine power to stabilize the BMW M3 and help avoid major over- or under-steer situations.

In addition to engine controls and the ABS, other systems integrated in the DSC are Automatic Stability Control (ASC), which prevents the wheels from spinning on surfaces with reduced traction; the Start-Off Assistant, which prevents the car from rolling back when setting off on a grade, as well as Cornering Brake Control (CBC), which prevents the car from spinning or swerving out of control when applying the brakes in a bend.

The latest version of DSC includes additional functions for even greater driving safety. Whenever the driver is likely to apply the brakes in full within the next few seconds, the system builds up pressure in the hydraulic brake circuit and pre-loads the brake pads to ensure an immediate response. The Dry Braking feature removes water film from the discs in wet conditions, thus reducing the chance of water interfering with the braking process.

Electronic Damper Control recognizing the driver's style of motoring

The optional Electronic Damper Control (EDC) allows the driver to tailor the vehicle's chassis dynamics to his or her preference through one of three modes: Sport, Normal and Comfort. The response of all dynamic driving systems is carefully tailored to the power and performance of the new BMW M3, with electronic intervention of the various systems naturally taking the dynamics of the car into account. Indeed, the driver even has the option to individually configure specific parameters, thus adjusting the response of the car to his personal preferences.

MDrive personalizes the driving characteristics of the new BMW M3

The new M3 provides several standard and optional driver-controlled systems to tailor the driving characteristics to a driver's personal preferences. The driver can choose, with conveniently located buttons:

• DSC on or off (for a very competent, performance-oriented driver)
• EDC in Sport, Normal or Comfort modes
• Servotronic in Sport or Comfort modes
• Throttle response either direct/sporting or comfort oriented

A push of the MDrive button on the steering wheel can instantaneously activate the above driver-selectable configurations, turning the new BMW M3 into his or her personalized Ultimate Driving Machine. The settings are stored through menus shown on the dash-mounted screen and controlled by the iDrive (located in the center console). Storing one's overall preferences under the MDrive allows the driver to modify any of the adjustable settings, yet return to his or her optimum with a simple press of the MDrive button. This feature requires the Navigation/iDrive option.

Athletic, sporting stance separates new BMW M3 Sedan from the pack

Front to back, the design of the new BMW M3 Sedan evokes a purposeful, sporting message. The front end, though clearly a BMW based on the double-kidney shaped grill, flat headlight units with standard Xenon headlamps, boasts three large air intakes below the grill. Since the structure and configuration is determined to primarily feed air into the engine compartment, the BMW M3 Sedan, like BMW M cars in general, intentionally forgoes fog lamps featured on 3 Series models.

The "face" of the new BMW M3 also includes a power dome in the middle of the aluminum hood which, though longer than that of the 3 Series Sedan, blends harmoniously with the overall design.

The two front side panels boast a special sign of distinction characteristic of a BMW M Car and referred to by the designers as "gills," which incorporate the tri-color (blue/purple/red M3) logo. Rear-view mirrors developed for the new BMW M3 fulfill an important aerodynamic function helping reduce air resistance. Further down the side-line, the pronounced side-sills, give the BMW M3 a light and sporting look.

The new BMW M3 Sedan looks muscular from behind, its design taking up the particular look of the car's front end. A discreet lip spoiler on the trunklid optimizes the car's streamlining and reduces lift on the rear axle. In its contours, the split diffuser beneath the rear bumper takes up the shape of the air intakes at the front of the car as the air guide and the dual tailpipes move towards the centerline of the car, visually contracting the rear end at the lower center point. A further feature is the circular shape of the four straight tailpipes in typical BMW M style.

The four metallic paints reserved for BMW M cars (Melbourne Red, Jerez Black, Interlagos Blue and Silverstone) highlight the body, contours and proportions of the four-door with particular intensity. In addition to these unique hues, the BMW M3 is available in Alpine White, Jet Black, or Sparkling Graphite Metallic.

Interior design oriented an active driving experience with luxury

The interior of the BMW M3 has always been a place designed for performance driving, but without compromising the comfort of the driver and the passengers. The new BMW M3 Sedan continues this tradition with the latest innovations. The five seats are surrounded by powerful contours and flowing lines highlighting in particular the concave and convex surfaces. The horizontal lines dominating the area around the dashboard as well as the harmonious surfaces of the side linings give the interior a dynamic note.

The cockpit control area tapers out between the front seats into a newly designed center console which discreetly "swings" towards the driver. Finished in black leather, the console harmoniously continues the instrument surrounds and the control area in terms of both color and shape, comprising three function switches (Power, DSC, and optional EDC) for activating and deactivating the electronic driving programs on the side facing the driver.

Apart from the clear design and optimum ergonomic arrangement of all controls and instruments, the choice of colors inside the new BMW M3 Sedan helps the driver concentrate on driving. Regardless of the upholstery and trim color, the footwells, parcel shelf, headliner, A-pillar trim and the upper part of the instrument panel are all finished in Anthracite. This uniform, dark color scheme around the windshield helps the driver focus on driving.

There is no question as to the heritage of the vehicle upon opening the door of the new BMW M3 thanks to the M car logo in the door sills. The unique nature of the vehicle carries to the dash where the dual circular instruments typical of BMW - the speedometer and fuel gauge as well as the tachometer and oil temperature display - are in specific M style. A feature typical of BMW M cars is the variable warning zone on the tachometer that informs the driver of the recommended engine speed depending on the engine oil temperature. The borderline between the yellow pre-warning zone and the red warning zone moves up as a function of increasing oil temperature to the maximum limit of 8,400 rpm. The digital displays presenting the time, the outside temperature and odometer, as well as the various warning lights, are positioned between the two circular instruments.