If you own a Mercedes-Benz, chances are you’ve seen the terms “A-Service” and “B-Service” pop up on your dashboard, in your owner’s manual, or during a conversation with your mechanic. While the A‑Service is fairly straightforward—an oil change, basic checks, and a reset—B‑Service is where things start to get more detailed.
At MB Wirral, we specialise in Mercedes servicing that not only meets but exceeds manufacturer expectations. Whether you’re new to Mercedes ownership or simply want to understand what you’re paying for, this article breaks down exactly what B‑Service includes, why it costs more than A‑Service, and why it’s essential to long-term vehicle health and resale value.
What Is Mercedes B‑Service?
B‑Service is a major scheduled service recommended by Mercedes-Benz typically every 20,000 miles or every 2 years—whichever comes first—after your initial A‑Service. It’s part of Mercedes’ Flexible Service System (FSS), which uses onboard diagnostics to track usage and driving conditions, notifying you when service is due.
While A‑Service focuses on fluid changes and basic wear-and-tear inspection, B‑Service is far more comprehensive. It includes everything in the A‑Service plus several key checks and replacements to ensure your car continues to operate at peak performance.
What’s Included in a Typical Mercedes B‑Service?
Here’s a breakdown of what is typically included in a full B‑Service at MB Wirral for most modern Mercedes models:
1. Synthetic Oil Change and Filter Replacement
We use fully synthetic, Mercedes-approved oil that meets the correct viscosity grade for your model (like 229.5 or 229.51), ensuring proper engine lubrication and performance. A genuine oil filter is also fitted.
2. Cabin Air Filter Replacement
Also known as the dust/pollen filter, this is replaced during every B‑Service to maintain clean airflow inside the vehicle and prevent HVAC strain.
3. Brake Fluid Change
Brake fluid attracts moisture over time, which reduces braking effectiveness and increases the risk of corrosion inside the brake system. Mercedes recommends a brake fluid replacement every 2 years—making B‑Service the ideal time.
4. Full Brake System Inspection
We remove all four wheels and inspect the condition of brake pads, discs, and sensors. If replacement is needed, we’ll inform you, never push you into unnecessary work.
5. Tyre Check and Pressure Adjustment
We examine all tyres for wear patterns, cracks, bulges, and tread depth. We then check and reset tyre pressures to match Mercedes’ specs.
6. Lights, Wipers, and Electrical Check
All external and internal lights are tested, including indicators, fog lights, and reverse lights. Wiper condition and washer systems are checked and topped up.
7. Battery Test
Battery voltage and cranking capacity are tested using professional tools to prevent mid-winter surprises.
8. Diagnostic Scan with STAR System
We connect your car to our Mercedes-Benz STAR diagnostic system. This reads fault codes across all modules—engine, gearbox, ABS, airbags, suspension, etc. If something’s brewing under the surface, we’ll catch it before it becomes a problem.
9. Digital Service Record Update
For vehicles with a digital service book, we log all service data directly to the Mercedes-Benz central database. This keeps your warranty and resale value intact.
Additional B‑Service Items (Depending on Model or Age)
Some models may also include:
- Transmission service (especially for 7G/9G-Tronic gearboxes)
- Differential oil replacement
- Fuel filter replacement (mostly diesel models)
- Air filter replacement
- Coolant strength and leak test
At MB Wirral, we check your specific model’s service sheet using your VIN and follow exactly what Mercedes prescribes—not more, not less.
Why Is B‑Service More Expensive?
Many owners wonder why B‑Service often costs significantly more than A‑Service. The simple answer: it’s a much more in-depth service that takes longer and includes more parts and fluid replacements.
While A‑Service may take 45–60 minutes, B‑Service can take 2–3 hours or more, depending on what’s required. The inclusion of brake fluid flush, filter replacements, diagnostics, and additional inspections increases both time and cost.
But consider this: skipping or delaying B‑Service can lead to costly repairs later—especially if key issues like low brake fluid, worn filters, or early battery failure are missed.
Do I Have to Go to the Dealer for B‑Service?
No—you absolutely don’t.
Thanks to the Block Exemption Regulation, you’re free to have your Mercedes serviced at an independent specialist without affecting your warranty, as long as:
- The correct OEM parts and fluids are used
- The manufacturer schedule is followed
- The service is recorded properly
MB Wirral ticks all those boxes. We use genuine or OE-equivalent parts, follow Mercedes’ official service bulletins, and log everything digitally when required. All at prices up to 40% less than main dealers.
Why Regular B‑Service Matters for Longevity
Skipping B‑Service or using a general garage unfamiliar with Mercedes can cost more in the long run. Here’s what regular, proper B‑Service does for you:
Preserves Warranty
Mercedes warranties require adherence to proper servicing schedules. Even after your main warranty ends, goodwill claims or extended cover options often depend on having complete records.
Improves Resale Value
Buyers and dealers both look for a well-maintained vehicle with a complete service history. Digital records updated with the Mercedes database can increase trust and resale price.
Prevents Breakdown
B‑Service often catches issues before they escalate. A weak battery, a leaking seal, or corroded brake lines might be minor now—but catastrophic later.
Keeps You Safe
Brakes, lights, tyres, fluid levels—these aren’t just vehicle components. They’re your protection on the road. B‑Service ensures they’re not left to chance.
What About Mileage vs. Time?
Mercedes recommends B‑Service every 20,000 miles or 2 years, but in some cases—like short-distance driving or harsh conditions—you might need it sooner. Your vehicle’s onboard maintenance system (FSS) will let you know. If the “Service B Due” message appears on your dashboard, it’s time.
Even if you’ve only driven 8,000 miles in 2 years, B‑Service is still essential. Fluids degrade with time, not just mileage.
Why Choose MB Wirral for B‑Service?
Here’s why hundreds of Mercedes owners across the Wirral trust us for their B‑Service:
- We’re Mercedes specialists, not a general garage
- We use STAR diagnostics, just like a dealer
- We follow Mercedes’ official service sheets
- We use Mercedes-approved parts and fluids
- We offer transparent pricing, no upsells
- We’re up to 40% more affordable than dealers
- We provide friendly, expert service trusted by the local community
And we do it all from our state-of-the-art Hoylake facility, with a comfortable waiting area, flexible booking, and optional local collection/drop-off.
What Our Customers Say
“Had my C-Class serviced here for the first time and won’t be going back to the main dealer again. Friendly team, knew exactly what the car needed, and saved me a fortune. Highly recommended.” – Shay K.
“Professional, honest, and efficient. MB Wirral gave me a full rundown of the service before starting and explained everything clearly after. Impressed with their STAR diagnostic setup too.” – Andy M.
Ready to Book Your B‑Service?
If your dashboard says “Service B Due” or you know it’s been around 2 years since your last major service, it’s time to get booked in. MB Wirral makes it simple and straightforward.
Call us today or book online. We’ll confirm your vehicle’s needs based on its age, model, and VIN—then give you a fixed quote before we begin. No surprises, just expert care for your Mercedes.
Drive with confidence. Let MB Wirral take care of your next B‑Service.
