104.945 engine — Mercedes-Benz 2.8 (2.8L)
2.8L · 193 hp
Engine overview
Vehicles with this engine
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | 104.945 |
| Capacity | 2799 cc |
| Idle speed | 650 - 800 rpm |
| Normal | 14.0 bar |
| Minimum | 10.0 bar |
| Normal | 10.0 bar |
| Minimum | 6.0 bar |
| Differential limit between cylinders | < 1.5 bar |
| Oil pressure | 3/3000 bar/rpm |
Engine (petrol)
| Fuel system (make and type) | Motronic HFM |
| Number of cylinders | 6 |
| Firing order | 1-5-3-6-4-2 |
| Spark plugs (make and type) | Bosch F8 DCO |
| Spark plug gap | 0.8 mm |
| Injection pressure/system pressure | 3.2 - 3.6 bar |
| Injection pressure/system pressure | 3.7 - 4.2 bar |
| CO exhaust gas | < 0.5 % |
| CO2 | 14.0 % |
| HC | 80 ppm |
| O2 | 0.1-0.5 % |
| CO at fast-idle speed | < 0.3 % |
| Fast-idle speed | 2200 - 2800 rpm |
| Lambda | 0.97 - 1.03 |
| Lambda change (Delta Lambda) | 0.02 |
| Oil temperature during test | 60 °C |
| Closed-loop test at: | 500 - 1100 rpm |
| Basic method | HFM (130 - 170) mbar |
| Alternative method (Germany only) | Nr. 2, 0 +/- 10 |
Cooling system
| Cap pressure | 1.4 ± 0.1 bar |
| Thermostat opens at | 85 - 89 °C |
| Thermostat fully open at | 102 °C |
Electrical
| Battery | 74 Ah |
| Alternator | 90/115 A |
Capacities
| Engine sump, incl. filter | 7.0 l |
| Manual transmission | 717.441 |
| Gearbox refill | 1.5 l |
| Automatic transmission | 722.424 |
| Initial filling | 6.6 l |
| Gearbox refill | 5.5 l |
| Automatic transmission | 722.510 |
| Initial filling | 7.3 l |
| Gearbox refill | 6.2 l |
| Differential | 1.1 l |
| Cooling system | 8.0 l |
| Air-conditioner refrigerant | 1000 g |
| Air-conditioner compressor oil | 120 ml |
Torque settings
| Cylinder head bolts — Stage 1 | 55 Nm |
| Cylinder head bolts — Stage 2 | 90 ° |
| Cylinder head bolts — Stage 3 | 90 ° |
| Oxygen sensor | 55 Nm |
| Spark plugs | 28 Nm |
| Wheel nuts | 110 Nm |
| Rear hub | 220 Nm |
| Rear hub | 320 Nm |
Workshop procedures for this engine
Step-by-step procedures from the workshop database.
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TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
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The story behind TorqFix →Workshop data on this page last updated 22 Aug 2026.