Practical UK guides to planning a service, choosing the right maintenance products and understanding dashboard reminders. Start with your vehicle, or choose the question you need answered.
Mercedes vehicle guides
Choose the model and generation that matches your car. A similar badge or service message does not establish the same maintenance requirements.
CLA220d C117: start here
Our first vehicle maintenance guide brings together oil information, service records and the questions to ask when arranging work.
Other Mercedes generations: service-message guides
These guides explain ASSYST in each generation. Use the applicable vehicle documents and service information to establish the actual work due.
Oil and service costs
For a CLA220d C117, use the engine-oil guide to distinguish Mercedes approval from viscosity and oil-change capacity from topping up. Use the service-cost guide to compare VAT, included operations and additional work.
Specifications, parts fitment and replacement timing are separate checks. Each article states its covered vehicle and the limits of the evidence.
Mercedes service messages explained
Choose the wording shown on the dashboard, or start with the system overview.
- ASSYST / ASSYST PLUS explained — how the reminder system fits into servicing.
- Service A and Service B — understand the service labels.
- Service codes, letters and numbers — identify which code system you are looking at.
- B5 service explained — why the visible suffix is not a universal parts list.
- What is an ASSYST PLUS workshop code? and how to find the appropriate workshop-code information.
- Service overdue / exceeded — understand the reminder and booking questions.
- ASSYST PLUS stuck at 365 days — what to check before assuming a fault.
Tools and diagnostics
Explore our OBD and diagnostic scanner guides when you need to investigate a separate warning or choose a tool. Fault-code reading, maintenance-data access and service confirmation are different functions: check the exact vehicle and function before buying.
For the cars themselves, browse Mercedes models, history and buying guides.
