The Mercedes-Benz B-Class (W245) B 180 CDI Autotronic, produced between April 2005 and April 2008, represented an entry point into the compact multi-purpose vehicle (MPV) segment for Mercedes-Benz. Positioned as a practical and fuel-efficient option, this variant utilized a diesel engine paired with a continuously variable transmission (CVT), marketed as Autotronic. It was a key model within the first generation of the B-Class, built on the W245 platform, which aimed to blend the practicality of a minivan with the driving experience of a conventional hatchback. The B 180 CDI Autotronic was primarily sold in Europe, where demand for diesel-powered, fuel-efficient vehicles was high.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | B-class |
| Generation | B-class (W245) |
| Type (Engine) | B 180 CDI (109 Hp) Autotronic |
| Start of production | April, 2005 |
| End of production | April, 2008 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | MPV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 7.3-7.9 l/100 km (32.2 – 29.8 US mpg, 38.7 – 35.8 UK mpg, 13.7 – 12.7 km/l) |
| Fuel consumption (extra urban) | 4.9-5.3 l/100 km (48 – 44.4 US mpg, 57.6 – 53.3 UK mpg, 20.4 – 18.9 km/l) |
| Fuel consumption (combined) | 5.9-6.2 l/100 km (39.9 – 37.9 US mpg, 47.9 – 45.6 UK mpg, 16.9 – 16.1 km/l) |
| CO2 emissions | 157-164 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 11.8 sec |
| Acceleration 0 – 62 mph | 11.8 sec |
| Acceleration 0 – 60 mph | 11.2 sec |
| Maximum speed | 178 km/h (110.6 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 12.8 kg/Hp, 78.1 Hp/tonne |
| Weight-to-torque ratio | 5.6 kg/Nm, 179.2 Nm/tonne |
| Power | 109 Hp @ 4200 rpm |
| Torque | 250 Nm @ 1600-2600 rpm (184.39 lb.-ft. @ 1600-2600 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | OM 640.940 |
| Engine displacement | 1991 cm3 (121.5 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 18:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 5.8 l (6.13 US qt | 5.1 UK qt) |
| Coolant capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Kerb Weight | 1395 kg (3075.45 lbs.) |
| Max. weight | 1880 kg (4144.69 lbs.) |
| Max load | 485 kg (1069.24 lbs.) |
| Trunk (boot) space – minimum | 544 l (19.21 cu. ft.) |
| Trunk (boot) space – maximum | 2245 l (79.28 cu. ft.) |
| Fuel tank capacity | 54 l (14.27 US gal | 11.88 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 1500 kg (3306.93 lbs.) |
| Permitted trailer load without brakes | 715 kg (1576.31 lbs.) |
| Permitted towbar download | 75 kg (165.35 lbs.) |
| Length | 4270 mm (168.11 in.) |
| Width | 1777 mm (69.96 in.) |
| Width including mirrors | 1975 mm (77.76 in.) |
| Height | 1604 mm (63.15 in.) |
| Wheelbase | 2778 mm (109.37 in.) |
| Front track | 1552 mm (61.1 in.) |
| Rear track | 1547 mm (60.91 in.) |
| Drag coefficient (Cd) | 0.30 |
| Minimum turning circle | 11.95 m (39.21 ft.) |
| Drivetrain | Front wheel drive |
| Gearbox | automatic transmission Autotronic |
| Front suspension | Independent type McPherson, Transverse stabilizer |
| Rear suspension | Transverse stabilizer, Coil spring |
| Front brakes | Ventilated discs, 288×25 mm |
| Rear brakes | Disc, 258×8 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 205/55 R16 |
| Wheel rims size | 6J x 16 |
Powertrain & Engine Architecture
The B 180 CDI Autotronic was powered by the OM 640.940, a 2.0-liter inline-four cylinder diesel engine. This engine was a common sight in various Mercedes-Benz models of the era. It featured a turbocharger with an intercooler to boost power and efficiency. The engine utilized a diesel common rail direct injection system, delivering fuel directly into the combustion chamber at extremely high pressure for improved combustion and reduced emissions. The engine produced 109 horsepower at 4200 rpm and 250 Nm (184 lb-ft) of torque between 1600 and 2600 rpm. The ‘Autotronic’ transmission was a continuously variable transmission (CVT), offering smooth, stepless gear changes. Unlike traditional automatic transmissions with fixed gear ratios, the CVT allowed the engine to operate at its most efficient point for any given speed and load.
Driving Characteristics
The B 180 CDI Autotronic prioritized fuel economy and comfortable cruising over outright performance. Acceleration from 0 to 62 mph (0-100 km/h) took approximately 11.8 seconds, and the top speed was 178 km/h (110.6 mph). The CVT transmission, while smooth, could sometimes feel less responsive than a traditional automatic or manual gearbox, particularly during quick acceleration. The engine’s torque delivery was relatively flat, providing adequate power for everyday driving situations. Compared to the more powerful B 200 CDI or petrol-powered variants, the B 180 CDI offered a more relaxed driving experience, focusing on efficiency and ease of use.
Equipment & Trim Levels
The B 180 CDI Autotronic typically came equipped with standard features such as air conditioning, power windows, central locking, and an audio system. Interior upholstery was generally cloth, with options for leather upgrades. Safety features included ABS brakes, airbags, and seatbelt pretensioners. Optional extras included a panoramic sunroof, upgraded audio systems, navigation, and parking sensors. The trim level was generally considered entry-level within the B-Class range, offering a good balance of features and affordability.
Chassis & Braking
The W245 B-Class featured an independent McPherson strut suspension at the front and a semi-independent torsion beam suspension at the rear. This setup provided a comfortable ride quality, suitable for everyday driving. The B 180 CDI was equipped with ventilated disc brakes at the front and solid disc brakes at the rear. ABS (Anti-lock Braking System) was standard, enhancing braking performance and stability. The suspension was tuned for comfort rather than sporty handling, prioritizing ride quality over sharp cornering.
Market Reception & Comparison
The B 180 CDI Autotronic was well-received in Europe as a practical and fuel-efficient MPV. Critics praised its spacious interior, comfortable ride, and low running costs. However, some reviewers noted the CVT transmission’s lack of responsiveness and the engine’s modest performance. Compared to the B 200 CDI, the B 180 CDI offered lower fuel consumption but less power. Against petrol-powered B-Class models, the B 180 CDI provided significantly better fuel economy, making it a popular choice for drivers covering long distances.
Legacy
The OM 640 engine family, including the OM 640.940 found in the B 180 CDI, is generally considered reliable, although regular maintenance is crucial. The Autotronic CVT transmission, however, has a mixed reputation. Some units have proven durable, while others have experienced issues with reliability, particularly if not serviced according to Mercedes-Benz’s recommendations. In the used car market, the B 180 CDI Autotronic remains an affordable option for those seeking a practical and fuel-efficient MPV. However, potential buyers should carefully inspect the transmission and ensure it has been properly maintained.
