The BMW 3 Series Touring (F31) 318d Steptronic, produced from 2012 to 2015, represents a compelling blend of practicality and efficiency within the broader F31 3 Series Touring range. Positioned as an entry-level diesel variant, it offered the benefits of a station wagon body style coupled with a relatively economical engine and the convenience of an eight-speed automatic transmission. This model catered to buyers seeking a versatile vehicle for family use or those requiring ample cargo space without the higher running costs associated with more powerful engines. It was a key offering in the European market, where the demand for touring (estate) models remained strong, and represented a significant portion of 3 Series sales.
Technical Specifications
| Brand | BMW |
| Model | 3 Series |
| Generation | 3 Series Touring (F31) |
| Type (Engine) | 318d (143 Hp) Steptronic |
| Start of production | 2012 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 5.5-5.7 l/100 km (42.8 – 41.3 US mpg) |
| Fuel consumption (extra urban) | 4.0-4.1 l/100 km (58.8 – 57.4 US mpg) |
| Fuel consumption (combined) | 4.5-4.7 l/100 km (52.3 – 50 US mpg) |
| CO2 emissions | 119-123 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 9.2 sec |
| Acceleration 0 – 62 mph | 9.2 sec |
| Acceleration 0 – 60 mph | 8.7 sec |
| Maximum speed | 210 km/h (130.49 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 10.5 kg/Hp |
| Weight-to-torque ratio | 4.7 kg/Nm |
| Power | 143 Hp @ 4000 rpm |
| Torque | 320 Nm @ 1750-2500 rpm (236.02 lb.-ft. @ 1750-2500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N47D20C |
| 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 | 5.2 l (5.49 US qt | 4.58 UK qt) |
| Coolant | 7 l (7.4 US qt | 6.16 UK qt) |
| Kerb Weight | 1495 kg (3295.91 lbs.) |
| Max. weight | 2045 kg (4508.45 lbs.) |
| Max load | 550 kg (1212.54 lbs.) |
| Trunk (boot) space – minimum | 495 l (17.48 cu. ft.) |
| Trunk (boot) space – maximum | 1500 l (52.97 cu. ft.) |
| Fuel tank capacity | 57 l (15.06 US gal | 12.54 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 1600 kg (3527.4 lbs.) |
| Permitted trailer load without brakes | 745 kg (1642.44 lbs.) |
| Permitted towbar download | 75 kg (165.35 lbs.) |
| Length | 4624 mm (182.05 in.) |
| Width | 1811 mm (71.3 in.) |
| Height | 1429 mm (56.26 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1543 mm (60.75 in.) |
| Rear (Back) track | 1583 mm (62.32 in.) |
| Ride height (ground clearance) | 140 mm (5.51 in.) |
| Drag coefficient (Cd) | 0.30 |
| Minimum turning circle (turning diameter) | 11.3 m (37.07 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Independent coil spring |
| Rear suspension | Independent multi-link suspension |
| 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 | 205/60 R16 92V; 225/55 R16; 225/50 R17; 255/45 R17; 225/45 R18; 255/40 R18; 225/40 R19; 255/35 R19 |
| Wheel rims size | 7J x 16; 7.5J x 16; 7.5J x 17; 8.5J x 17; 8J x 18; 8.5J x 18; 8J x 19; 8.5J x 19 |
INTRODUCTION
The F31 318d Steptronic, launched in 2012, was a key component of BMW’s fifth-generation 3 Series Touring lineup. Built on the 1HX0/A3 platform, it offered a practical and efficient option for buyers seeking a premium station wagon. This variant was specifically designed to appeal to those prioritizing fuel economy and comfortable cruising over outright performance. It occupied the lower end of the 3 Series Touring range, serving as a more accessible entry point compared to the more powerful 320d, 328i, and xDrive models. The F31 generation represented a significant step forward in terms of interior quality, technology, and driving dynamics compared to its predecessor (E91).
Powertrain & Engine Architecture
At the heart of the 318d Steptronic lies the N47D20C 2.0-liter four-cylinder diesel engine. This engine is a member of BMW’s highly regarded N47 family, known for its efficiency and refinement. The N47D20C utilizes a second-generation common rail direct injection system, delivering fuel at pressures up to 1800 bar for optimized combustion. It also features a twin-scroll turbocharger with variable geometry turbine (VGT) technology, enhancing low-end torque and responsiveness. The engine’s aluminum alloy cylinder head incorporates four valves per cylinder, operated by a single overhead camshaft. The eight-speed Steptronic automatic transmission, a ZF-sourced unit, is a crucial element of this variant. It provides smooth and efficient gear changes, contributing to both fuel economy and driving comfort. The transmission features a torque converter and allows for manual gear selection via steering wheel-mounted paddles or the gear selector lever.
Driving Characteristics
The 318d Steptronic delivers a comfortable and refined driving experience. While not offering the exhilarating acceleration of higher-powered 3 Series models, it provides ample torque for everyday driving situations. The 320 Nm (236 lb-ft) of torque, available from 1750-2500 rpm, ensures effortless overtaking and confident cruising. The eight-speed automatic transmission is well-matched to the engine’s characteristics, providing smooth and timely gear changes. Compared to the six-speed manual transmission available on other 318d models, the Steptronic offers enhanced convenience and fuel efficiency. However, some drivers may find the automatic transmission slightly less engaging than the manual option. The 0-60 mph time of approximately 8.7 seconds is respectable for a diesel-powered station wagon, but it’s noticeably slower than the 320d or 328i variants.
Equipment & Trim Levels
The 318d Steptronic typically came equipped with a generous level of standard features. These included automatic climate control, a BMW Professional radio system with iDrive controller, power windows and mirrors, and a multi-function steering wheel. Interior upholstery was typically cloth, although leather options were available as upgrades. Standard safety features included ABS, stability control, and multiple airbags. Optional extras included navigation system, upgraded audio systems, sunroof, parking sensors, and heated seats. Trim levels varied depending on the market, but generally followed a progression from base “Sport” to higher-spec “Luxury” or “Modern” trims, offering progressively more luxurious appointments and features.
Chassis & Braking
The F31 318d Steptronic utilizes a sophisticated chassis design. The front suspension features independent coil springs and MacPherson struts, while the rear suspension employs an independent multi-link setup. This configuration provides a good balance between ride comfort and handling precision. The steering is electrically assisted, offering precise and responsive control. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) is standard, enhancing safety in emergency braking situations. The suspension tuning is generally geared towards comfort, but the 318d still offers a reasonably engaging driving experience, particularly on winding roads.
Market Reception & Comparison
The 318d Steptronic was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and spacious interior. However, some reviewers noted that the engine lacked the outright performance of its more powerful siblings. Compared to the 320d, the 318d offered lower running costs but sacrificed some performance. The 328i, on the other hand, provided significantly more power but at the expense of fuel economy. The 318d’s combination of practicality, efficiency, and affordability made it a popular choice for families and company car drivers.
Legacy
The N47D20C engine, while generally reliable, has been known to exhibit some issues, particularly related to timing chain wear. Regular oil changes and preventative maintenance are crucial for ensuring long-term reliability. The eight-speed Steptronic transmission has proven to be a durable and reliable unit. Today, the F31 318d Steptronic represents a relatively affordable entry point into BMW ownership. It remains a practical and efficient option for those seeking a versatile station wagon. Its reputation for reliability, combined with its relatively low running costs, makes it a popular choice in the used car market.
