The Mini Hatch (F55, facelift 2018) 5-door Cooper D 1.5 (116 Hp) Steptronic represents a significant iteration within the third generation of the modern Mini Hatchback. Introduced in 2018 as part of a mid-life refresh for the F55 chassis, this variant aimed to provide a balance of fuel efficiency, practicality, and the iconic Mini driving experience. Positioned as a mid-range offering within the five-door Hatch lineup, it slotted between the entry-level One D and the more powerful Cooper D models. This particular configuration, combining a 1.5-liter three-cylinder diesel engine with a seven-speed Steptronic automatic transmission, was primarily targeted at European markets where diesel fuel remained popular and automatic transmissions were gaining acceptance.
| Brand | Mini |
| Model | Hatch |
| Generation | Hatch (F55, facelift 2018) 5-door |
| Type (Engine) | Cooper D 1.5 (116 Hp) Steptronic |
| Start of production | 2018 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Hatchback |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 4.3-4.5 l/100 km (54.7 – 52.3 US mpg) |
| Fuel consumption (extra urban) | 3.6-3.8 l/100 km (65.3 – 61.9 US mpg) |
| Fuel consumption (combined) | 3.9-4.0 l/100 km (60.3 – 58.8 US mpg) |
| CO2 emissions | 102-106 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 9.6 sec |
| Acceleration 0 – 62 mph | 9.6 sec |
| Acceleration 0 – 60 mph | 9.1 sec |
| Maximum speed | 202 km/h (125.52 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 10.6 kg/Hp |
| Weight-to-torque ratio | 4.6 kg/Nm |
| Power | 116 Hp @ 4000 rpm |
| Torque | 270 Nm @ 1750-2250 rpm (199.14 lb.-ft. @ 1750-2250 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | B37C15A |
| Engine displacement | 1496 cm3 (91.29 cu. in.) |
| Number of cylinders | 3 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 90 mm (3.54 in.) |
| Compression ratio | 16.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 4.8 l (5.07 US qt | 4.22 UK qt) |
| Coolant | 3.3 l (3.49 US qt | 2.9 UK qt) |
| Kerb Weight | 1230 kg (2711.69 lbs.) |
| Max. weight | 1755 kg (3869.11 lbs.) |
| Max load | 525 kg (1157.43 lbs.) |
| Trunk (boot) space – minimum | 278 l (9.82 cu. ft.) |
| Trunk (boot) space – maximum | 941 l (33.23 cu. ft.) |
| Fuel tank capacity | 44 l (11.62 US gal | 9.68 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Length | 3982 mm (156.77 in.) |
| Width | 1727 mm (67.99 in.) |
| Height | 1425 mm (56.1 in.) |
| Wheelbase | 2567 mm (101.06 in.) |
| Front track | 1501 mm (59.09 in.) |
| Rear track | 1501 mm (59.09 in.) |
| Ride height (ground clearance) | 146 mm (5.75 in.) |
| Drag coefficient (Cd) | 0.30 |
| Minimum turning circle | 11.0 m (36.09 ft.) |
| Drivetrain Architecture | Front wheel drive |
| Number of gears | 7 |
| Gearbox type | Automatic transmission Steptronic |
| Front suspension | Independent, McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric |
| Tires size | 175/65 R15 84H |
| Wheel rims size | 5.5J x 15 |
Powertrain & Engine Architecture
The heart of the Cooper D 1.5 Steptronic is the BMW Group’s B37C15A 1.5-liter three-cylinder diesel engine. This engine is part of the modular B-series engine family, known for its compact design and efficiency. The B37 utilizes a turbocharger with variable geometry and intercooling to boost power and torque. Fuel is delivered via a common rail direct injection system, operating at extremely high pressures to optimize combustion. The engine features four valves per cylinder and a compression ratio of 16.5:1, contributing to its thermal efficiency. The seven-speed Steptronic automatic transmission is a conventional torque-converter automatic, offering smooth shifts and a wide range of gear ratios. It’s programmed for fuel efficiency and comfort, with a sport mode available for more responsive shifting.
Driving Characteristics
The 116 hp and 270 Nm (199 lb-ft) of torque produced by this powertrain configuration provide adequate, though not exhilarating, performance. Acceleration from 0-60 mph takes approximately 9.1 seconds, and top speed is around 125 mph. The Steptronic transmission is well-matched to the engine’s torque curve, providing seamless gear changes and keeping the engine within its optimal operating range. Compared to the manual transmission version, the automatic offers greater convenience, particularly in urban driving. However, it does slightly diminish the sense of driver engagement. Compared to the more powerful Cooper D variants, this 1.5-liter engine feels less responsive, especially during overtaking maneuvers. The gear ratios are tuned for economy, meaning the engine can feel strained when pushed hard.
Equipment & Trim Levels
The Cooper D 1.5 Steptronic typically came equipped with a respectable level of standard features. These included air conditioning, power windows, central locking, a basic infotainment system with Bluetooth connectivity, and alloy wheels. Interior upholstery was typically cloth, with options for leather upgrades. Common optional extras included a panoramic sunroof, navigation system, parking sensors, and upgraded sound systems. Trim levels varied slightly depending on the market, but generally, this variant occupied a middle ground, offering a good balance of features and affordability. The five-door body style added practicality with increased rear passenger space and easier access to the rear seats.
Chassis & Braking
The F55 Mini Hatch utilizes a McPherson strut front suspension and a multi-link rear suspension, providing a comfortable yet sporty ride. The suspension is tuned to minimize body roll and provide precise handling. The Cooper D 1.5 Steptronic typically featured ventilated front disc brakes and solid rear disc brakes. ABS (Anti-lock Braking System) was standard, enhancing braking performance and stability. The electric power steering provides light and precise steering feel. Stabilizer bars are fitted front and rear to further reduce body roll during cornering. The chassis was designed to accommodate a range of engine and transmission combinations, with slight adjustments made to spring rates and damper settings to optimize handling for each configuration.
Market Reception & Comparison
The Mini Cooper D 1.5 Steptronic was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and the iconic Mini design. However, some reviewers noted that the engine lacked the punch of its larger counterparts and that the automatic transmission could feel somewhat sluggish in certain situations. Compared to the manual transmission version, the automatic offered slightly lower fuel economy but greater convenience. Against competitors like the Audi A1 and Volkswagen Polo, the Mini offered a more premium feel and a more engaging driving experience, but at a higher price point.
Legacy
The B37C15A engine, while generally reliable, has been known to exhibit issues with the turbocharger and fuel injectors in some cases. Regular maintenance, including oil changes and fuel filter replacements, is crucial for ensuring long-term reliability. The Steptronic transmission is also generally robust, but proper servicing is essential to prevent issues. On the used car market, the Cooper D 1.5 Steptronic represents a relatively affordable entry point into Mini ownership. Its fuel efficiency and practicality make it a popular choice for urban commuters. However, potential buyers should be aware of the potential maintenance costs associated with diesel engines and automatic transmissions.
