Mercedes A and B service – what's the difference?

You'll probably get a message in your driver's screen telling you which service your car is due for. An A service is a standard-level service, while the B service is more involved and covers more parts.

What's the difference between Mercedes A and B service?

What is Service A on a Mercedes?

An A service is the basic level of service your Mercedes needs. Drivers who cover average mileages will need one service per year, alternating between a simpler A service and a more involved B service. You can think of an A service as comparable to a minor service or a 'fluids-and-filters' service.

The most important feature of the A service is the replacement of your engine oil and oil filter. This prolongs engine life and minimises the risk of internal damage. Your car will also have a safety inspection for critical parts like tyres, brakes and suspension.

What is Service B on a Mercedes?

A B service is a little more involved than an A service. It's comparable to a major service and includes a longer list of items to inspect and more parts to replace. You'll need a B service every other year, alternating against your A service.

The B service includes all the standard parts of the A service like your oil and oil filter, but it also includes the replacement of your cabin filter, which handles air coming through your climate control. You also get all the same safety inspections as an A service, but with extra step of replacing your brake fluid.

Do I need a service A or B for my Mercedes?

The benefit of Mercedes' automated servicing system is that your car keeps track of what services it's had. As a result, it will tell you through the driver's information display what service it needs, so you don't need to keep note of which service is due.

You simply make note of which service the car is requesting, then book that particular service with your chosen Mercedes service centre. Whether it's a Mercedes-branded centre or a quality independent garage, they should be able to reset your digital service record once they've carried out the work.

Which is more expensive, Mercedes' A or B service?

The B service is more involved than the A service, so it's unsurprising that the B service costs more to carry out. Just like other carmakers that instruct owners to alternate between minor and major services, so too does Mercedes require owners to switch between A and B services with each year.

As a premium brand, Mercedes servicing costs tend to be more expensive than more mainstream vehicles. That means you should budget for extra running costs if you want a car with a three-pointed star.

You might be able to slightly reduce these costs by servicing your car with an independent garage. However, make sure they can update your digital service record, and confirm they use OEM-grade parts and processes before booking your car in.

Mercedes numbered A and B services explained

Older Mercedes models included a number next to the service letter indicator – for example, 'B2'. This gave a clearer indication of what parts needed inspection or replacement. This has since been phased out for newer Mercedes models.

This is an overview of what those numbered Mercedes service indicators mean:

Learn more about servicing and MOT

Read our guide to car servicing and our explainer on MOTs. Or, to understand the difference between the two, check our our servicing vs MOT comparison.