Mercedes-Benz A Service and B Service Guide
Mercedes-Benz uses a Service A / Service B alternating maintenance interval system. Service A occurs first (typically around 10,000 miles or 1 year), then Service B at approximately 20,000 miles or 2 years, then A again, and so on. Express Auto performs both services with Mercedes-approved synthetic oil, genuine filters and a maintenance-counter reset using Snap-on and Matco bi-directional scan tools.
Call (650) 588-9199Labor Time
1.5–2 hours (Service A), 2–3 hours (Service B)
Pricing
Service A: $350–$450 | Service B: $650–$950
Serving
San Bruno, San Francisco, Burlingame, Hillsborough, San Mateo, Palo Alto, Millbrae
Warranty
12-month/12,000-mile parts and labor warranty
Common Symptoms
If you experience these symptoms, your Mercedes C-Class / E-Class / GLC / GLE / S-Class may need a service / b service:
Why This Happens
Understanding the root cause helps prevent future issues:
Our Repair Process
How we handle a service / b service at Express Auto in San Bruno:
ASSYST inspection with a Snap-on or Matco bi-directional scan tool: read stored fault codes, check adaptive values, confirm which service is due and what the maintenance counter shows.
Oil and filter service: drain and refill with Mercedes-Benz-approved 229.5 or 229.51 full synthetic (typically 0W-40 or 5W-30 depending on engine). Install OEM or OEM-equivalent filter.
Service A inspection checklist: tire condition and pressure, brake pad thickness front and rear, all fluid levels (coolant, washer, power steering), cabin filter, wiper blades, lights.
Service B additions: replace cabin air filter (HEPA-grade), replace brake fluid with DOT 4 Plus, replace dust/pollen filter if equipped, spark plug inspection (replacement if interval reached).
ASSYST reset: use a bi-directional scan tool to reset the maintenance counter and set the correct next service interval. Without proper reset, the system will not accurately predict the next due date.
Road test and final inspection: verify no warning lights, confirm brake feel after fluid change, check all electrical systems, ensure smooth operation.
Parts & Warranty
Parts Used
oil
Mercedes-Benz 229.5 or 229.51 full synthetic, 0W-40 or 5W-30
filter
OEM or OEM-equivalent Mercedes oil filter
brake Fluid
Mercedes-Benz Brake Fluid DOT 4 Plus (Service B)
cabin Filter
OEM cabin/pollen filter (Service B)
Service Details
Labor Time
1.5–2 hours (Service A), 2–3 hours (Service B)
Pricing
Service A: $350–$450 | Service B: $650–$950
Warranty
12-month/12,000-mile parts and labor warranty
Frequently Asked Questions
What is the difference between Mercedes Service A and Service B?
Service A is the lighter annual service: synthetic oil and filter change, fluid top-off, tire pressure check, brake inspection, and ASSYST reset. Service B (every other year) includes everything in Service A plus brake fluid replacement, cabin air filter replacement, and a more comprehensive inspection of spark plugs, belts, and hoses.
How much does Mercedes Service A and B cost at Express Auto?
Express Auto charges $350–$450 for Service A and $650–$950 for Service B (AMG models quoted separately), using Mercedes-approved synthetic oil, genuine filters and an ASSYST reset with our bi-directional scan tools.
Can Express Auto reset the Mercedes ASSYST Plus maintenance indicator?
Yes. We reset the ASSYST Plus maintenance counter with Snap-on and Matco bi-directional scan tools, including the individual counters for oil life, brake fluid, spark plugs and cabin filter. Without this reset, the maintenance counter does not accurately reflect what has been serviced.
What Mercedes models does Express Auto service?
We service all Mercedes-Benz models: C-Class (W204, W205, W206), E-Class (W212, W213), GLC, GLE, GLB, CLA, A-Class, S-Class (W221, W222), and AMG models. We have experience with the 4MATIC AWD system, 9G-TRONIC transmission, and all current OM654/M264 turbocharged engines.
Does an independent shop Mercedes service void my warranty?
No. Mercedes cannot void your factory warranty because you chose an independent shop. We document all services with Mercedes-approved parts and fluid specifications. For Mercedes CPO warranty vehicles, we recommend confirming specific requirements, but regular service at an independent shop does not void the factory warranty.
What oil does Mercedes require for Service A and B?
Most current Mercedes gasoline engines require MB 229.5 or 229.51 specification oil, typically a 0W-40 or 5W-30 full synthetic. Some BlueTEC diesel and newer AMG engines have different specifications. We always verify the correct oil specification from Mercedes records before your service — using the wrong spec can void engine warranty and cause damage.
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We serve Mercedes owners across the Peninsula. Free inspection, walk-in or by appointment: a code scan plus a visual inspection.