Service A / Service B
About 25,000 km or 1 year (ASSYST)
25 000 km
12 months
Oil and filter at each service; Service B adds filters and wider checks. The ASSYST indicator prevails.
Source [1]W221 · 2005–2009
Mercedes Classe S S 320 CDI W221 · 235 hp (2005 to 2009)
The Mercedes Classe S S 320 CDI of the W221 generation uses the OM642 3.0 V6 CDI diesel engine with 235 hp.
Choose an engine
Identify the car and prepare its maintenanceTechnical specifications
- Fuel
- Diesel
- Power
- 235 PS / 173 kW
- Displacement
- 2 987 cm³
- Cylinders
- 6
- Engine code
- OM642 3.0 V6 CDI
- Period covered
- 2005–2009
- Documented market
- Europe
Transmission
- Automatic · 7 speeds
Figures apply to the cited configuration and market; equipment and transmissions may vary by production date.
Specification source : [1] AutoKarnet
This version
235 hp (173 kW), rear-wheel drive, 7-speed automatic. Built from 2005 to 2009.
AutoKarnet advice
In the range
It is the entry-level diesel version of this generation. The OM642 3.0 V6 CDI engine is also fitted to: Mercedes Classe C (W204), Mercedes Classe E (W211), Mercedes Classe E (W212), Mercedes CLS (C218), Mercedes Classe S (W222), Mercedes GLE / ML (ML W164).
AutoKarnet advice
Maintenance and records
Brake fluid
Every 24 months
24 months
Time-based replacement, whatever the mileage.
Source [1]Questions about this version (2)
Which engine is in the Mercedes Classe S S 320 CDI W221?
The OM642 3.0 V6 CDI diesel engine (2 987 cc), 235 hp (173 kW).
AutoKarnet advice
Which oil for the Mercedes Classe S S 320 CDI?
A MB 229.5 / 229.51 / 229.52-approved oil suited to the OM642 3.0 V6 CDI engine.
AutoKarnet advice
Documentary sources
- [1] Rédaction AutoKarnet
AutoKarnet · FR · Europe · Synthèse éditoriale AutoKarnet · Accessed 09/10/2026