For a Mercedes SLK230 Kompressor R170, start with the engine identity, the complete service reminder and dated invoices. The later Mercedes manual identifies a smaller A service and a larger B service. Those labels help plan a visit; they do not establish which filters, plugs or fluids your particular car needs today.
Which SLK230 Kompressor do you have?
| SLK230 application | Engine | MANN output |
|---|---|---|
| R170.447 — earlier version | M111.973, 2,295 cc | 142 kW / 193 hp |
| R170.449 — later version | M111.983, 2,295 cc | 145 kW / 197 hp |
MANN’s current application pages distinguish these two 2.3-litre engines. Their catalogue dates overlap around 2000, so registration year alone is a poor way to choose between them. Confirm the model and engine details from vehicle documentation, particularly if an engine has been replaced.
The parts guide linked below covers both named engines. The service-display and oil-manual references in this article come from a February 2003 Mercedes R170 manual. They should be checked against the manual supplied with an earlier car rather than assumed identical.
What the later R170 ASSYST display means
The inspected manual describes ASSYST as the active service system. It shows the approaching appointment in time or distance and distinguishes the smaller A and larger B service using the service symbols. Driving conditions affect the interval.
Record the full display and mileage before requesting a quotation. If the appointment is exceeded, the manual describes a minus sign with the reminder. This is service information; a separate warning lamp or running fault still needs its own assessment.
The display does not provide an itemised record of past maintenance. The general Mercedes Service A and Service B guides explain the wider labels, while the car’s applicable service documentation establishes its operations.
Build a useful service history from individual jobs
An invoice reading only “full service” leaves important questions unanswered. Create a short record of the date, mileage and parts used for each job. This helps a specialist identify what is due, what is already documented and what needs a baseline because history is missing.
| Item | Evidence to look for |
|---|---|
| Oil and oil filter | Exact oil product, MB approval, filter reference, date and mileage. |
| Engine air filter | A named renewal, distinct from the cabin filter. |
| Cabin filtration | Complete reference and actual renewal date. |
| Spark plugs | Engine-specific plug reference and quantity fitted. |
| Brake fluid and coolant | Renewal records, distinct from level checks. |
| Transmission | Gearbox identity and any separate fluid/filter work. |
Use the service booklet to establish timing. A parts catalogue can identify an application but cannot tell you that every listed part is due at the next A or B service. Ask the garage to distinguish scheduled work from recommendations prompted by missing records or an observed condition.
Low mileage and time spent in storage
The later manual warns that time with the battery disconnected is not counted by the service display. Keep the dates of any such storage and tell the workshop. A countdown on its own can therefore miss elapsed time relevant to planning the service.
Keep calendar dates alongside mileage. For a car returning to use after storage, supply a separate list of symptoms and visible problems, such as leaks, poor starting or a roof fault. This makes it easier to agree the maintenance visit and diagnostic work clearly.
Ask for a quotation you can compare
- Give the garage the model, engine details, mileage and complete reminder.
- Supply the last itemised invoices and any battery-disconnected storage dates.
- Ask which checks and renewals are included, with labour and VAT clear.
- Request the oil approval and full filter references.
- Confirm the spark-plug choice against the actual engine.
- Identify the gearbox before agreeing transmission work.
- Keep fault investigation separate from routine service operations.
After the work, retain the invoice and updated service record. A reset changes the reminder; it does not prove that the maintenance has been completed. An accidentally reset display should be raised with the workshop rather than used as a new history baseline.
Use the related guides before ordering
The SLK230 oil capacity and approvals guide explains the later manual’s distinction between a service change and first fill. The SLK230 filters and spark-plugs guide compares the MANN filter applications and the different NGK plugs for the early and later engines.
Find the wider collection in our Mercedes maintenance hub. For separate running faults, gearbox or roof diagnosis, use our R170 diagnostic scanner guide.
Sources and coverage
- Mercedes R170 manual, printed pages 138–139 / viewer pages 139–140: ASSYST, A/B display and time accounting.
- MANN C 24 106 application catalogue: model and engine identities.
- MANN HU 727/1 x application catalogue: both named SLK230 versions.
Checked 20 October 2026. Mercedes manual evidence here is the German-language February 2003 R170 edition, mirrored by ManualsLib. Its instructions are scoped to that later manual; use the service booklet and market-specific manual applicable to your own car.
