The BMW 728i, produced between 1995 and 1998, was a key variant within the E38 generation of the 7 Series luxury sedan. Positioned as the entry-level model in many markets, particularly North America and Europe, it offered a balance of BMW’s renowned driving experience and luxury features at a more accessible price point than its larger-engined siblings. The E38 7 Series represented a significant leap forward for BMW in terms of technology, build quality, and overall refinement, establishing a new benchmark in the full-size luxury segment. The 728i specifically utilized the M52B28 engine paired with a 5-speed Steptronic automatic transmission, catering to buyers prioritizing comfort and ease of use over outright performance.
Technical Specifications
| Brand | BMW |
| Model | 7 Series |
| Generation | 7 Series (E38) |
| Type (Engine) | 728i (193 Hp) Steptronic |
| Start of production | 1995 |
| End of production | 1998 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 16 l/100 km (14.7 US mpg, 17.7 UK mpg, 6.3 km/l) |
| Fuel consumption (extra urban) | 8.3 l/100 km (28.3 US mpg, 34 UK mpg, 12 km/l) |
| Fuel consumption (combined) | 11.1 l/100 km (21.2 US mpg, 25.4 UK mpg, 9 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 9.6 sec |
| Acceleration 0 – 62 mph | 9.6 sec |
| Acceleration 0 – 60 mph | 9.1 sec |
| Maximum speed | 225 km/h (139.81 mph) |
| Weight-to-power ratio | 8.8 kg/Hp, 113.5 Hp/tonne |
| Weight-to-torque ratio | 6.1 kg/Nm, 164.7 Nm/tonne |
| Power | 193 Hp @ 5300 rpm |
| Power per litre | 69.1 Hp/l |
| Torque | 280 Nm @ 3950 rpm (206.52 lb.-ft. @ 3950 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M52B28 |
| Engine displacement | 2793 cm3 (170.44 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 84 mm (3.31 in.) |
| Compression ratio | 10.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 5.75 l (6.08 US qt | 5.06 UK qt) |
| Coolant | 11 l (11.62 US qt | 9.68 UK qt) |
| Kerb Weight | 1700 kg (3747.86 lbs.) |
| Max. weight | 2235 kg (4927.33 lbs.) |
| Max load | 535 kg (1179.47 lbs.) |
| Trunk (boot) space – minimum | 500 l (17.66 cu. ft.) |
| Fuel tank capacity | 85 l (22.45 US gal | 18.7 UK gal) |
| Length | 4984 mm (196.22 in.) |
| Width | 1862 mm (73.31 in.) |
| Height | 1435 mm (56.5 in.) |
| Wheelbase | 2930 mm (115.35 in.) |
| Front track | 1552 mm (61.1 in.) |
| Rear (Back) track | 1568 mm (61.73 in.) |
| Drag coefficient (Cd) | 0.30 |
| Minimum turning circle | 11.6 m (38.06 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears and type of gearbox | 5 gears, automatic transmission Steptronic |
| Front suspension | Wishbone |
| Rear suspension | Inclined Lever |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 215/65 R16 |
| Wheel rims size | 16 |
Powertrain & Engine Architecture
The heart of the 728i is the M52B28, a 2.8-liter inline-six engine. This engine is a naturally aspirated, dual overhead camshaft (DOHC) design with four valves per cylinder. It utilizes a Bosch Motronic 5.1 engine management system and multi-port fuel injection. The M52 series engines were known for their smooth power delivery and relatively high reliability. The 728i’s M52B28 produced 193 horsepower at 5300 rpm and 280 Nm (206.52 lb-ft) of torque at 3950 rpm. Paired with this engine was a 5-speed Steptronic automatic transmission, BMW’s branded automatic with a manual shift mode. This transmission offered a balance between convenience and driver control, though it wasn’t as sporty as the available manual transmission in other 7 Series models.
Driving Characteristics
The 728i’s driving experience was geared towards comfort and refinement. The automatic transmission, while offering manual shift capability, prioritized smooth gear changes over aggressive downshifts. Acceleration from 0 to 60 mph took approximately 9.1 seconds, making it noticeably slower than the 740i or 750iL models. However, the 728i provided ample power for everyday driving and highway cruising. The engine’s torque curve was relatively flat, providing good responsiveness in most situations. The suspension, tuned for comfort, absorbed bumps and imperfections in the road effectively, contributing to a relaxed ride quality. Compared to the manual transmission versions, the automatic 728i felt less engaging but more accessible to a wider range of drivers.
Equipment & Trim Levels
The 728i came standard with a comprehensive list of luxury features, including leather upholstery, power-adjustable front seats with memory function, automatic climate control, a premium sound system, and wood trim. Standard safety features included ABS, traction control, and airbags. Optional extras included a navigation system, a sunroof, upgraded leather, and rear seat entertainment. The trim level was generally consistent across the 728i models, with options allowing for personalization. The interior design emphasized elegance and functionality, with a focus on creating a comfortable and inviting cabin.
Chassis & Braking
The E38 7 Series featured a robust chassis with independent suspension at all four wheels. The front suspension utilized a double wishbone design, while the rear employed an inclined lever setup. This configuration provided a good balance of ride comfort and handling precision. The 728i was equipped with ventilated disc brakes at the front and solid disc brakes at the rear. ABS was standard, enhancing braking performance and stability. The steering was a rack-and-pinion system with hydraulic power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The 728i was generally well-received by automotive critics as a comfortable and refined luxury sedan. However, its performance was often criticized as being underwhelming compared to its more powerful siblings. Fuel economy was considered reasonable for a vehicle of its size and class, averaging around 21.2 US mpg in combined driving. Compared to the 740i, the 728i offered a lower price point but sacrificed performance. The 728i also provided a more affordable alternative to the flagship 750iL, which boasted a V12 engine and even more luxurious features. The 728i appealed to buyers who prioritized comfort, refinement, and value over outright performance.
Legacy
The E38 728i, while not the most sought-after variant of the E38 generation, remains a respected and reliable luxury sedan. The M52B28 engine is known for its durability and relatively simple maintenance requirements. Today, well-maintained examples of the 728i are becoming increasingly collectible. Common issues include age-related wear and tear on suspension components, cooling system leaks, and electrical gremlins. However, with proper care, the 728i can provide many years of comfortable and reliable service. Its blend of luxury, comfort, and relative affordability has made it a popular choice among enthusiasts seeking a classic BMW experience.
