Mercedes S 320 2005 CDI
Mercedes S class 2005 3.0 diesel description
Sedan Mercedes S 320 2005 CDI has been produced from 2005 to September, 2008. It has six-cylinder diesel engine with displacement of 3.0 litres, which produces power of 235 horsepower on 3800 rpm and torque 540 Nm (Newton metres) on 1600 revolutions per minute.
This 6-cylinder 24-valve engine camshaft is driven by chain (What is an engine chain and belt? ). Engine has Common Rail fuel system, it has no turbine. Engine versions compliant with Euro 5 and Euro 6 emission standards available. Approximate engine life expectancy (mileage until serious repairs are required) for this engine is between 360 000 and 600 000 kilometres. Note that engine life can be longer or shorter depending on maintenance.
More engine specs
The Mercedes-Benz OM642 is a 3.0-liter V6 diesel widely used in many models under the 3.0 CDI or 350 CDI designation. It is known for strong performance and good durability when maintained properly, and well-kept engines are capable of exceeding 500,000 ...
This Mercedes S class 3.0 engine oil type is 5W-30, MB 228.51/229.51 and oil capacity is 8.8 litres.
Mercedes S 320 2005 CDI has classical rear wheel drive (RWD) and automatic gearbox with 7 gears.
Mercedes S 320 2005 CDI accelerates to speed 100 kilometres per hour in 7.5 seconds. The maximum speed of this car is 250 km/h.
In combined cycle (city and motorway), the Mercedes S 320 2005 CDI fuel consumption is 8.3 litres per 100km (12 km/l) - this is the most fuel efficient Mercedes S klase 2005 - 2009 version, city fuel economy - 11.6 l/100km, fuel consumption on highway - 6.4 l/100km. Fuel tank capacity is 90 litres or 23.78 gallons, which gives a mileage up to 1080 kilometers without refueling in urban cycle and even up to 1400 kilometers on highway.
According to user reviews, this Mercedes real everyday fuel consumption is 10 litres per 100 km, which is 20% more than the manufacturer's stated. More - Real Mercedes S class fuel consumption.
- Mercedes S 320 2006 CDI 4Matic AT 4x4 is more sluggish, reaching 100 km/h 0.3 seconds later (in 7.8 seconds), but manufacturer's fuel consumption is higher by 0.4 litres per 100 km or 5 % - 8.7 litres per 100 km, whereas users reported real fuel consumption is lower by 0.3 litres per 100 km or 3 % - 9.7 litres per 100 km
- Mercedes S 320 2006 CDI 4Matic Long AT 4x4 is more sluggish, reaching 100 km/h 0.3 seconds later (in 7.8 seconds), but manufacturer's fuel consumption is higher by 0.6 litres per 100 km or 7 % - 8.9 litres per 100 km, whereas users reported real fuel consumption is lower by 0.3 litres per 100 km or 3 % - 9.7 litres per 100 km
Mercedes S 320 2005 CDI technical data
| Model: | Mercedes S 320 2005 CDI | ||
|---|---|---|---|
| Body style: | Sedan | ||
| Production period: | 2005. December ... 2008. September | ||
| Engine: | 2987 cm3 Diesel, 6 cylinders | CO2 emissions: | 220 g/km |
| Power: | 235 HP ON 3800 RPM | Torque: | 540 NM ON 1600 RPM |
| Gearbox: | Automatic gearbox (7 gears) | Drive type: | Rear wheel drive (RWD) |
| Top speed: | 250 km/h | Acceleration 0-100 km/h: | 7.5 seconds |
| Fuel consumption (l/100km): | 8.3 (combined) 11.6 (urban) 6.4 (highway) | ||
| Real fuel consumption: | 10 l/100km (23.5 MPG) by user reviews from various sources | ||
| Fuel tank capacity: | 90 litres (23.8 gallons) | ||
| Car dimensions: | 5.08m (length) 1.87m (width) 1.47m (height) | ||
| Turning diameter: | 12 meters | ||
| Trunk capacity: | 560 litres | ||
| Gross weight: | 2100 kg | ||
Mercedes S 320 2005 CDI engine OM642 350 CDI
Engine reliability and common problems:
The Mercedes-Benz OM642 is a 3.0-liter V6 diesel widely used in many models under the 3.0 CDI or 350 CDI designation. It is known for strong performance and good durability when maintained properly, and well-kept engines are capable of exceeding 500,000 km. At the same time, the unit has several characteristic weak points that tend to appear with age.One of the most well-known problems affects early engines produced before around 2010. The oil cooler sits deep in the valley of the V-engine, and the sealing gaskets eventually harden and begin to leak. When this happens, oil accumulates in the center of the engine block, and fixing the issue requires significant disassembly, making the repair relatively expensive.
The intake system can also cause trouble. The swirl flaps are operated by plastic linkages that may break over time, which leads to uneven engine operation, warning lights, and reduced power. The Bosch fuel system itself is generally efficient, but the piezo injectors are sensitive to fuel quality and are expensive to replace, often with little possibility of repair.
Turbocharger problems sometimes appear as mileage grows. Carbon deposits may cause the variable geometry mechanism to stick, and in some cases particles from a deteriorating exhaust manifold can damage the turbocharger. The engine is also quite sensitive to oil pressure. Issues with the oil pump, contaminated oil, or overheating can lead to bearing damage if lubrication becomes insufficient.
Additional concerns include the crankcase ventilation system, where the membrane inside the PCV valve may fail, as well as typical diesel emissions components such as the EGR valve and diesel particulate filter, which can become clogged over time.
Despite these weaknesses, the OM642 remains a respected engine when serviced correctly. It delivers strong performance, uses a durable double-row timing chain, and the cylinder heads are equipped with hydraulic lifters that reduce maintenance needs. With regular oil changes—preferably every 10,000 km or sooner—and good-quality fuel, it can be a long-lasting and capable diesel engine.
Overall, this engine can last around 360,000 to 600,000 km if properly maintained, using the correct quality oil and fuel, and carrying out regular checks and maintenance.
The engine has hydraulic valve tappets (lifters), which provide quieter operation and do not require periodic adjustment, but are more complex in design and can cause serious engine damage in the event of failure.
| Engine displacement | 2987 cm3 |
|---|---|
| Number of cylinders | 6 |
| Bore (cylinder diameter) | 83 mm |
| Stroke length (piston move) | 92 mm |
| Compression ratio | 18 : 1 |
| Camshaft drive | Timing chain Chain motors are considered more reliable, chain replacement usually is required less often than a timing belt, but they are often louder and vibrate more. More service info |
| Timing chain change interval | 400,000 km (recommended) Sometimes manufacturers do not specify timing chain replacement intervals and design chains for engine life. However, once the recommended change interval has been reached, it is recommended to periodically check the condition of the chain and to change the chain if excessive stretching is detected or if unusual noises from the engine or other symptoms occur. |
| Fuel system | Common Rail Common rail fuel injection provides more engine power, is quieter, more environmentally friendly and offers better fuel economy, but is more expensive to maintain and repair. |
| Mercedes S 320 2005 CDI oil type | 5W-30, MB 228.51/229.51 |
| Oil capacity | 8.8 litres (9.3 quarts) More service info |
| Power | 231 - 265 HP ON 3800 RPM |
| Torque | 540 - 620 NM ON 1600 RPM |
| Start of production (year) | 2005 |
| Duration of production | 21 years |
| Engine also used on | Mercedes C klase Mercedes E klase Mercedes ML and 6 other models |
Generally, the use of an engine in several models and its long production run is an indication of the quality of the engine and the success of its design. |
All Mercedes S class sedan [2005 - 2009] modifications
| Modification | Engine | Power | Consumption | Drive type |
|---|---|---|---|---|
|
Mercedes S 320 2005 CDI
Dec 2005 — Sep 2008 Most fuel efficient diesel version |
3.0 Diesel | 235 HP | 8.3 l/100km | Rear wheel |
| Mercedes S 320 2005 CDI Long Dec 2005 — Sep 2008 | 3.0 Diesel | 235 HP | 8.4 l/100km | Rear wheel |
|
Mercedes S 320 2006 CDI 4Matic 4x4
Sep 2006 — Jan 2009 Most fuel efficient diesel version by real consumption |
3.0 Diesel | 235 HP | 8.7 l/100km | All wheel |
|
Mercedes S 320 2006 CDI 4Matic Long 4x4
Sep 2006 — Jan 2009 Most fuel efficient diesel version by real consumption |
3.0 Diesel | 235 HP | 8.9 l/100km | All wheel |
|
Mercedes S 350 2005
Most fuel efficient petrol version |
3.5 Petrol | 272 HP | 10.1 l/100km | Rear wheel |
|
Mercedes S 350 2005 Long
Most fuel efficient petrol version |
3.5 Petrol | 272 HP | 10.1 l/100km | Rear wheel |
|
Mercedes S 420 2006 CDI
Sep 2006 — Jan 2009 Most powerfull diesel version (320 HP) |
4.0 Diesel | 320 HP | 9.4 l/100km | Rear wheel |
|
Mercedes S 420 2006 CDI Long
Sep 2006 — Jan 2009 Most powerfull diesel version (320 HP) |
4.0 Diesel | 320 HP | 9.6 l/100km | Rear wheel |
| Mercedes S 450 2006 Jul 2006 — Jan 2009 | 4.7 Petrol | 340 HP | 11.2 l/100km | Rear wheel |
| Mercedes S 450 2006 Lang Jul 2006 — Jan 2009 | 4.7 Petrol | 340 HP | 11.0 l/100km | Rear wheel |
| Mercedes S 450 2006 4Matic 4x4 Jul 2006 — Jan 2009 | 4.7 Petrol | 340 HP | 12.0 l/100km | All wheel |
| Mercedes S 450 2006 4Matic Long 4x4 Jul 2006 — Jan 2009 | 4.7 Petrol | 340 HP | 11.7 l/100km | All wheel |
| Mercedes S 500 2005 | 5.5 Petrol | 388 HP | 12.0 l/100km | Rear wheel |
| Mercedes S 500 2005 Long | 5.5 Petrol | 388 HP | 12.0 l/100km | Rear wheel |
| Mercedes S 500 2006 4Matic 4x4 Jul 2006 — Jan 2009 | 5.5 Petrol | 388 HP | 12.0 l/100km | All wheel |
| Mercedes S 500 2006 4Matic 4x4 Jul 2006 — Jan 2009 | 5.5 Petrol | 388 HP | 12.1 l/100km | All wheel |
| Mercedes S 500 2006 4Matic Long 4x4 Jul 2006 — Jan 2009 | 5.5 Petrol | 388 HP | 12.0 l/100km | All wheel |
| Mercedes S 600 2005 Long Dec 2005 — Jan 2009 | 5.5 Petrol | 517 HP | 14.0 l/100km | Rear wheel |
|
Mercedes S 65 2006 AMG Long
Jun 2006 — Jan 2009 Most dynamic version - 100 km/h in 4.4 seconds |
6.0 Petrol | 612 HP | 15.0 l/100km | Rear wheel |
| Mercedes S 63 2006 AMG Nov 2006 — Jan 2009 | 6.2 Petrol | 525 HP | 15.0 l/100km | Rear wheel |
| Mercedes S 63 2006 AMG Long Nov 2006 — Jan 2009 | 6.2 Petrol | 525 HP | 15.0 l/100km | Rear wheel |