The B Service includes the A Service, as well as an inspection of the vehicle's underbody, and air and cabin filters (if needed). The B Service should be performed every 20k miles (or one year after previous service). Note that the model and year of your car may dictate whether specific services and inspections will be added or subtracted.
Services performed:
Interior
- Function check
- Check warning and indicator lamps, illumination and interior lighting
- Check windshield wiper, windshield washer system, headlamp cleaning system
- Reset maintenance service counter in instrument cluster
- Replace dust filter (not applicable to SL-Class)
- Replace combination filter (SL-Class)
- Check parking brake (function test only)
- Check condition/thickness of front and rear brake discs
- Check front and rear brake pads for lining thickness
- Check tires for damage and condition
- Measure tread depth, record in mm
- Correct tire inflation pressure
- Check for major components leakage
- Check for chafe marks, line routing, damaged components
- Check condition of front axle ball joints and rubber boots
- Check condition of mechanical steering components and rubber boots
- Check for major components leakage
- Check for chafe marks, line routing, damaged components
- Check and replenish all fluid levels
- Change engine oil and filter
- Check engine cooling system, antifreeze and corrosion protection
- Check brake system
- Check power steering
- Check Active Body Control
- Check windshield washer system
- Check and correct battery fluid level
- Check battery condition
- Check catch, safety catch and hinges on engine hood for proper operation
- Check condition of poly V-belt
- Check battery condition
- Correct tire inflation pressure in spare tire