From another site:
A" and "B" services items listed....
Mercedes-Benz Flex Service Details
*Pricing is for approximate illustration purposes only, pricing may differ at your dealership, please consult your dealership for current pricing*
A-Flex Service Approximate cost $199 - $249
Replace engine oil and genuine MBZ oil filter
Lubricate hood hinges
Inspect brakes
Inspect cooling system
Check & clean air filter (replacement additional)
Inspect windshield wiper inserts & service windshield washer system (replacement of wipers additional)
Inspect heating & ventilation dust filter (replacement additional)
Inspect lines & hoses
Inspect & lubricate throttle linkage
Check tire pressure (including spare)
Check horns, lights, seat belts, tires & brake pads for wear
Check & top-off all fluids
Reset Flexible Service System counter
Wash Vehicle
Road test
B-Flex Service Approximate cost $299 - $449
Replace engine oil & genuine MBZ oil filter
Analyze engine management system with Mercedes-Benz Star Diagnostic System Tester
Rotate tires (excludes AMG models with staggered wheels)
Lubricate hood hinges
Inspect brakes
Inspect cooling system
Check & clean air filter (replacement additional)
Inspect windshield wiper inserts & service windshield washer system (replacement of wipers additional)
Inspect heating & ventilation dust filter (replacement additional)
Inspect & lubricate throttle linkage
Check tire pressure (including spare)
Check horns, lights, seat belts, tires & brake pads for wear
Inspect front axle ball joints; & rear differential levels
Check steering play & power steering clutch
Inspect Poly V-Belt for condition
Inspect Climate control refrigerant
Check & top-off all fluids
Reset Flexible Service System counter
Wash Vehicle
Road test
Additional Dealer Recommendations
A/C Evaporator Cleaning - $129
Fuel Injector Service - $139
Replace Cabin Air Filter (consult dealer for model pricing)
Brake Fluid Exhange - $129
Power Steering Service $169
Cooling System Service - $149
Factory Recommended Transmission Service
Recommended at 39,000 miles
Vehicles equiped with a .6 transmission - $279
Vehicles equiped with a .9 transmission - $359
Transmission Service Includes the Following
Remove transmission pan
Replace transmission filter & pan gasket
Renew fluid (5 quarts synthetic transmission fluid)
Road test to verify proper gearshift performance
*Pricing is for approximate illustration purposes only, pricing may differ at your dealership, please consult your dealership for current pricing*
Personally I've done my own maintenance since I retired- that way I know it's done right.