The BMW 3 Series Convertible (E93) 330d, produced from 2007 to 2008, represented a compelling blend of performance, luxury, and open-air driving enjoyment within the broader E93 generation. Positioned as a mid-range offering in the 3 Series Convertible lineup, the 330d distinguished itself through its efficient and powerful diesel engine, offering a different character than its gasoline-powered siblings. It was primarily aimed at the European market, where diesel engines held a significant share of the premium car segment, but limited examples were also available in other regions. The E93 itself was the first fully retractable hardtop convertible in the 3 Series lineage, replacing the fabric roof of the E46 generation.
Technical Specifications
| Brand | BMW |
| Model | 3 Series |
| Generation | 3 Series Convertible (E93) |
| Type (Engine) | 330d (231 Hp) |
| Start of production | 2007 |
| End of production | 2008 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 9.3 l/100 km (25.3 US mpg) |
| Fuel consumption (extra urban) | 5.3 l/100 km (44.4 US mpg) |
| Fuel consumption (combined) | 6.8 l/100 km (34.6 US mpg) |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7 sec |
| Acceleration 0 – 62 mph | 7 sec |
| Acceleration 0 – 60 mph | 6.7 sec |
| Maximum speed | 245 km/h (152.24 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 7.6 kg/Hp |
| Weight-to-torque ratio | 3.5 kg/Nm |
| Power | 231 Hp @ 4000 rpm |
| Torque | 500 Nm @ 1750 rpm (368.78 lb.-ft. @ 1750 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M57D30TU2 |
| Engine displacement | 2993 cm3 (182.64 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 90 mm (3.54 in.) |
| Compression ratio | 17:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 7.5 l (7.93 US qt | 6.6 UK qt) |
| Coolant capacity | 7.8 l (8.24 US qt | 6.86 UK qt) |
| Kerb Weight | 1755 kg (3869.11 lbs.) |
| Max. weight | 2180 kg (4806.08 lbs.) |
| Max load | 425 kg (936.96 lbs.) |
| Trunk (boot) space – minimum | 210 l (7.42 cu. ft.) |
| Trunk (boot) space – maximum | 350 l (12.36 cu. ft.) |
| Fuel tank capacity | 63 l (16.64 US gal | 13.86 UK gal) |
| Length | 4580 mm (180.31 in.) |
| Width | 1782 mm (70.16 in.) |
| Width including mirrors | 1985 mm (78.15 in.) |
| Height | 1384 mm (54.49 in.) |
| Wheelbase | 2760 mm (108.66 in.) |
| Front track | 1500 mm (59.06 in.) |
| Rear track | 1513 mm (59.57 in.) |
| Front overhang | 771 mm (30.35 in.) |
| Rear overhang | 1049 mm (41.3 in.) |
| Ride height (ground clearance) | 138 mm (5.43 in.) |
| Drag coefficient (Cd) | 0.29 |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 6 |
| Gearbox type | Manual transmission |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 225/45 R17 |
| Wheel rims size | 17 |
Powertrain & Engine Architecture
The heart of the 330d Convertible was the M57D30TU2, a 3.0-liter inline-six diesel engine. This engine was a highly refined unit, benefiting from BMW’s extensive experience with diesel technology. The ‘TU2’ designation indicated an updated version of the M57 engine family, incorporating improvements to fuel injection, turbocharging, and engine management. It utilized a second-generation common rail direct injection system, delivering fuel at extremely high pressures for optimized combustion and reduced emissions. The engine featured a single variable geometry turbocharger (VGT) with an intercooler, providing a broad torque curve and responsive performance. The valvetrain employed four valves per cylinder, contributing to efficient gas exchange. The 330d was exclusively offered with a six-speed manual transmission, providing drivers with full control over the engine’s power. The transmission was known for its precise shift quality and robust construction.
Driving Characteristics
The 330d Convertible offered a distinctly different driving experience compared to its gasoline-powered counterparts. While not as outright quick as the 335i, the 330d excelled in providing strong, usable torque throughout the rev range. The 500 Nm (368 lb-ft) of torque, available from just 1750 rpm, allowed for effortless cruising and confident overtaking. The six-speed manual transmission, while requiring more driver involvement than an automatic, provided a rewarding and engaging driving experience. The car felt well-balanced and planted, typical of the E93 chassis. Fuel economy was a significant advantage, making it a practical choice for long-distance travel. Compared to the 325i, the 330d offered noticeably more torque and a more relaxed driving experience, while the 335i provided more peak horsepower and a sportier feel.
Equipment & Trim Levels
The 330d Convertible typically came well-equipped, reflecting its position as a mid-range model. Standard features included leather upholstery, automatic climate control, a multi-function steering wheel, and a BMW Professional radio system. Optional extras were plentiful, allowing buyers to personalize their vehicles. Popular options included sport seats, navigation system, premium sound system, park distance control, and heated seats. The convertible top was fully automatic and could be operated at speeds up to 40 km/h (25 mph). Interior trim options included various wood and aluminum finishes.
Chassis & Braking
The E93 330d Convertible utilized a MacPherson strut front suspension and a multi-link rear suspension, providing a comfortable yet controlled ride. The suspension was tuned to balance handling and comfort, making it suitable for both everyday driving and spirited cornering. Braking duties were handled by ventilated disc brakes at the front and solid disc brakes at the rear. Anti-lock braking system (ABS) was standard, enhancing safety and stability. The steering was a rack-and-pinion system with hydraulic power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The 330d Convertible was generally well-received by automotive critics, who praised its fuel efficiency, strong torque, and comfortable ride. It was often seen as a sensible alternative to the more expensive and less economical 335i. However, some critics noted that the diesel engine lacked the refinement and responsiveness of the gasoline engines. In terms of reliability, the M57D30TU2 engine proved to be a robust and durable unit, although preventative maintenance, particularly regarding the diesel particulate filter (DPF), was crucial. Compared to other diesel convertibles of the time, the 330d offered a compelling combination of performance, luxury, and practicality.
Legacy
The E93 330d Convertible has maintained a reasonable level of popularity in the used car market. The M57D30TU2 engine is known for its longevity, and well-maintained examples can still provide years of reliable service. However, potential buyers should be aware of the potential for DPF issues and the importance of regular oil changes. The E93’s retractable hardtop remains a desirable feature, offering the convenience of a coupe with the open-air enjoyment of a convertible. The 330d represents a unique offering within the E93 lineup, appealing to drivers who prioritize fuel efficiency and torque without sacrificing driving pleasure.
