Servicing & Maintenance Guides / Mercedes
Mercedes servicing and maintenance guides for UK owners: find vehicle-specific oil and filter information, compare service costs and understand ASSYST / ASSYST PLUS reminders. Start with your model, or choose the message shown on your dashboard.
Choose your Mercedes
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
Start with the CLA220d C117 maintenance overview, then choose a guide to oil, filters, service costs or dashboard reminders.
C220 CDI W204: OM651 servicing
Plan the service, check engine-oil approval and capacity, and choose filters for the covered OM651 application.
- Mercedes C220 CDI W204 Service & Maintenance Guide (OM651)
- Mercedes C220 CDI W204 Oil Capacity & Approval (OM651)
- Mercedes C220 CDI W204 Oil & Air Filters: OM651 Part Numbers
- Mercedes W204 C220 CDI Cabin Filter: RHD MANN References
For dashboard reminders, see the W204 ASSYST PLUS service-message guide.
E220 CDI W212: OM651 servicing
Plan the service, check the documented oil approval and capacity, and compare the Euro 5/Euro 6 engine-filter branches and right-hand-drive cabin filters.
- Mercedes E220 CDI W212 Service & Maintenance Guide (OM651)
- Mercedes E220 CDI W212 Engine Oil: Capacity & Approval
- Mercedes E220 CDI W212 Filters: Oil, Air & Cabin References
For dashboard reminders, see the W212 ASSYST PLUS service-message guide.
C220 d W205: OM651 servicing
Identify the earlier OM651 application, check its oil reference, compare engine filters and distinguish the ventilation prefilter from the main cabin-filter choices.
- Mercedes C220 d W205 Service & Maintenance Guide (OM651)
- Mercedes C220 d W205 Oil Capacity & Approval: OM651
- Mercedes C220 d W205 Oil & Air Filters: OM651 vs OM654
- Mercedes W205 Cabin Filters: Prefilter, CUK & RHD FP Choices
For dashboard reminders, see the W205 ASSYST PLUS service-message guide.
E220 d W213: OM654 servicing
Explore maintenance planning, documented oil approvals and capacity, and filter references for the selected E220 d OM654.920 application.
Mercedes service-message guides by generation
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 Mercedes OBD2 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.