The BMW 3 Series Touring (G21) 318d Steptronic, produced from 2019 to 2022, represents BMW’s entry point into the premium compact executive estate car segment. Positioned as a diesel-powered variant within the G21 generation – the sixth iteration of the 3 Series Touring – it offered a blend of practicality, efficiency, and the brand’s renowned driving dynamics. This model aimed to appeal to buyers seeking a versatile vehicle for both daily commuting and longer journeys, prioritizing fuel economy and comfortable cruising over outright performance. It sits on the BMW Group’s flexible 1HX0 platform, shared with other models like the 3 Series sedan and the Z4 roadster.
Technical Specifications
| Brand | BMW |
| Model | 3 Series |
| Generation | 3 Series Touring (G21) |
| Type (Engine) | 318d (150 Hp) Steptronic |
| Start of production | 2019 |
| End of production | 2022 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 4.8-5.2 l/100 km (49 – 45.2 US mpg, 58.9 – 54.3 UK mpg, 20.8 – 19.2 km/l) |
| Fuel consumption (extra urban) | 4.1-4.4 l/100 km (57.4 – 53.5 US mpg, 68.9 – 64.2 UK mpg, 24.4 – 22.7 km/l) |
| Fuel consumption (combined) | 4.4-4.7 l/100 km (53.5 – 50 US mpg, 64.2 – 60.1 UK mpg, 22.7 – 21.3 km/l) |
| CO2 emissions | 114-123 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 8.8 sec |
| Acceleration 0 – 62 mph | 8.8 sec |
| Acceleration 0 – 60 mph | 8.4 sec |
| Maximum speed | 215 km/h (133.59 mph) |
| Emission standard | Euro 6d – TEMP |
| Weight-to-power ratio | 11.1 kg/Hp, 90.4 Hp/tonne |
| Weight-to-torque ratio | 5.2 kg/Nm, 192.8 Nm/tonne |
| Power | 150 Hp @ 4000 rpm |
| Torque | 320 Nm @ 1500-3000 rpm (236.02 lb.-ft. @ 1500-3000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B47D20B |
| Engine displacement | 1995 cm3 (121.74 cu. in.) |
| Number of cylinders | 4 |
| 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 | Twin-power turbo, Intercooler |
| Engine oil capacity | 5.5 l (5.81 US qt | 4.84 UK qt) |
| Coolant | 7 l (7.4 US qt | 6.16 UK qt) |
| Kerb Weight | 1660 kg (3659.67 lbs.) |
| Max. weight | 2180 kg (4806.08 lbs.) |
| Max load | 520 kg (1146.4 lbs.) |
| Trunk (boot) space – minimum | 500 l (17.66 cu. ft.) |
| Trunk (boot) space – maximum | 1510 l (53.33 cu. ft.) |
| Fuel tank capacity | 40 l (10.57 US gal | 8.8 UK gal) |
| Permitted trailer load with brakes (8%) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load with brakes (12%) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 75 kg (165.35 lbs.) |
| Length | 4709 mm (185.39 in.) |
| Width | 1827 mm (71.93 in.) |
| Width including mirrors | 2068 mm (81.42 in.) |
| Height | 1440 mm (56.69 in.) |
| Wheelbase | 2851 mm (112.24 in.) |
| Front track | 1579 mm (62.17 in.) |
| Rear (Back) track | 1569 mm (61.77 in.) |
| Front overhang | 799 mm (31.46 in.) |
| Rear overhang | 1059 mm (41.69 in.) |
| Drag coefficient (Cd) | 0.27 |
| Minimum turning circle (turning diameter) | 11.4 m (37.4 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 225/50 R17 98 Y XL |
| Wheel rims size | 7.5J x 17 |
Powertrain & Engine Architecture
The 318d Touring utilizes BMW’s B47D20B engine, a 2.0-liter inline-four cylinder diesel engine. This engine is a member of BMW’s modular engine family, known for its efficiency and refinement. The B47 features a cast iron block and aluminum cylinder head, incorporating direct common-rail fuel injection and a single twin-scroll turbocharger with intercooling. This configuration allows for a broad torque curve, delivering 320 Nm (236 lb-ft) between 1500 and 3000 rpm. The engine’s output of 150 horsepower at 4000 rpm is sufficient for comfortable cruising and everyday driving. The Steptronic 8-speed automatic transmission is a crucial component, offering smooth and quick gear changes. It’s programmed for efficiency, prioritizing higher gears at cruising speeds, but also provides responsive downshifts when needed. The transmission features a torque converter and allows for manual gear selection via steering wheel-mounted paddles in some configurations.
Driving Characteristics
The 318d Steptronic offers a composed and comfortable driving experience. While not as dynamically engaging as higher-powered 3 Series variants like the 330i, it provides ample power for most driving situations. The 8-speed automatic transmission contributes to a relaxed driving style, with smooth transitions between gears. Acceleration from 0 to 60 mph takes approximately 8.4 seconds, and the car reaches a top speed of 133.59 mph. The engine’s strong low-end torque makes overtaking at highway speeds relatively effortless. Compared to the manual transmission version, the Steptronic offers increased convenience, particularly in urban traffic. However, some driving enthusiasts may find the automatic transmission slightly less engaging than the manual option. The rear-wheel-drive configuration provides a balanced feel, although it can require more careful throttle control in slippery conditions.
Equipment & Trim Levels
The 318d Touring typically came equipped with a generous amount of standard features. These included BMW’s iDrive infotainment system with a central touchscreen display, automatic climate control, power-adjustable front seats, and a leather-wrapped steering wheel. Safety features such as ABS, stability control, and multiple airbags were standard. Optional extras included features like a panoramic sunroof, upgraded audio system, navigation system, adaptive cruise control, and parking assist. Interior upholstery was typically cloth, with leather options available as an upgrade. Trim levels varied slightly depending on the market, but generally offered packages that bundled popular options together.
Chassis & Braking
The G21 3 Series Touring features a sophisticated chassis design. The front suspension utilizes MacPherson struts, while the rear suspension employs a multi-link setup. This configuration provides a good balance between ride comfort and handling precision. The 318d typically came equipped with ventilated disc brakes on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) is standard, enhancing safety during emergency braking situations. The suspension tuning is geared towards comfort, but still allows for confident cornering. Stabilizer bars are fitted front and rear to reduce body roll.
Market Reception & Comparison
The 318d Touring was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and spacious interior. However, some reviewers noted that it lacked the outright performance of higher-powered 3 Series variants. Compared to the 320d, the 318d offered a more affordable entry point into the 3 Series Touring range, but with a noticeable reduction in power and performance. The 318d’s fuel economy was a key selling point, consistently achieving figures in the range of 50-60 mpg in real-world driving. Reliability has been generally good, although diesel particulate filter (DPF) issues can occur if the vehicle is primarily used for short trips.
Legacy
The BMW 3 Series Touring (G21) 318d Steptronic has established itself as a practical and efficient estate car in the used car market. The B47 engine, while known for potential DPF issues with improper maintenance, is generally considered robust and reliable when properly cared for. The Steptronic transmission has also proven to be durable. These vehicles offer a compelling combination of practicality, comfort, and fuel economy, making them a popular choice for families and individuals seeking a versatile and refined estate car. As with any used vehicle, a thorough inspection and maintenance history check are essential before purchase.
