2.9 d inline-six (Mercedes OM656)
Diesel · 2,925 cm³ · 183–270 kW
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Fuel: Diesel. Timing drive: chain.
In our database this engine is fitted to 7 model generations, among them: Mercedes-Benz GLE (V167), Mercedes-Benz E-Class (W213), Mercedes-Benz S-Class (W222), Mercedes-Benz S-Class (W223), Mercedes-Benz GLS (X167), Mercedes-Benz G-Class (W463) and 1 more.
Key facts
| Fuel | Diesel |
|---|---|
| Displacement | 2,925 cm³ |
| Power | 183–270 kW |
| Years | 2017–2027 |
| Timing drive | Chain |
| Oil | 0W-30 / 5W-30 · MB 229.52 / 229.71 · ~7.5–8.5 L · every 15,000 km |
| Engine codes | OM656 |
Known engine faults
Faults that belong to the engine itself. They apply to every model with this engine, and each model has its own extra faults on its model page.
No typical faults on record.
Engine-related service
Intervals and typical prices, using the Mercedes-Benz E-Class (W213) as an example. The app gives the exact plan for your car.
| Item | Interval | Typical price |
|---|---|---|
| DPF health check (soot / ash load)Emissions | every 20,000 km | €0–60 |
| Engine oil + oil filterEngine | every 15,000 km or every 12 months | €70–150 |
| Air filterEngine | every 30,000 km or every 24 months | €15–45 |
| Fuel filterFuel | every 30,000 km or every 24 months | €40–110 |
| Glow plugsEngine | every 100,000 km | €120–300 |
| Auxiliary (serpentine) beltEngine | every 120,000 km | €70–180 |
| Coolant replacementCooling | every 150,000 km or every 96 months | €70–150 |
| Timing chain inspection (listen on cold start)Engine | every 150,000 km | €0–120 |
Models with this engine
Model generations this engine is fitted to.
Mercedes-Benz CLS (C257) 2018–2023Mercedes-Benz E-Class (W213) 2016–2023Mercedes-Benz G-Class (W463) 1990–Mercedes-Benz GLE (V167) 2019–Mercedes-Benz GLS (X167) 2019–Mercedes-Benz S-Class (W222) 2013–2020Mercedes-Benz S-Class (W223) 2020–
Common questions
Does the 2.9 d inline-six (Mercedes OM656) engine have a timing chain or a timing belt?
Chain.
What oil does the 2.9 d inline-six (Mercedes OM656) engine take?
0W-30 / 5W-30 · MB 229.52 / 229.71 · ~7.5–8.5 L · every 15,000 km.
Which cars have the 2.9 d inline-six (Mercedes OM656) engine?
Mercedes-Benz GLE (V167), Mercedes-Benz E-Class (W213), Mercedes-Benz S-Class (W222), Mercedes-Benz S-Class (W223), Mercedes-Benz GLS (X167), Mercedes-Benz G-Class (W463) and 1 more.
Sources and notes
Faults, intervals and prices are indicative and collected from public sources and owner experience; always rely on the service book and a qualified workshop. Test statistics: DVSA – Anonymised MOT tests and results, Open Government Licence v3.0. Dutch tests: RDW Open Data (CC0). Engine versions: EEA, monitoring of CO₂ emissions from new passenger cars (CC BY 4.0, DG CLIMA). Owner complaints: NHTSA ODI (public domain). Recalls: DVSA Vehicle Safety Branch Recalls Database, OGL v3.0. Brand and model names are trademarks of their owners and are used only to describe the vehicles.
Updated 08/10/2026