The BMW 728i, part of the E38 7 Series facelift produced from 1998 to 2001, represented a key entry point into BMW’s flagship luxury sedan range. Positioned below the more powerful 730i, 740i, and 750iL models, the 728i offered a balance of refinement, performance, and relative affordability within the E38 lineup. The facelift brought subtle but significant cosmetic and technological updates to the E38, solidifying its position as a benchmark for luxury automobiles. This variant was primarily aimed at buyers who desired the prestige and comfort of a 7 Series without the higher price tag associated with the larger displacement engines.
Technical Specifications
| Brand | BMW |
| Model | 7 Series |
| Generation | 7 Series (E38, facelift 1998) |
| Type (Engine) | 728i (193 Hp) |
| Start of production | 1998 |
| End of production | 2001 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 13.7 l/100 km (17.2 US mpg, 20.6 UK mpg, 7.3 km/l) |
| Fuel consumption (extra urban) | 7.9 l/100 km (29.8 US mpg, 35.8 UK mpg, 12.7 km/l) |
| Fuel consumption (combined) | 10 l/100 km (23.5 US mpg, 28.2 UK mpg, 10 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.6 sec |
| Acceleration 0 – 62 mph | 8.6 sec |
| Acceleration 0 – 60 mph | 8.2 sec |
| Maximum speed | 228 km/h (141.67 mph) |
| Weight-to-power ratio | 8.9 kg/Hp, 112.9 Hp/tonne |
| Weight-to-torque ratio | 6.1 kg/Nm, 163.7 Nm/tonne |
| Power | 193 Hp @ 5300 rpm |
| Power per litre | 69.1 Hp/l |
| Torque | 280 Nm @ 3500 rpm (206.52 lb.-ft. @ 3500 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 | 1710 kg (3769.9 lbs.) |
| Max. weight | 2245 kg (4949.38 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 |
| Drive wheel | Rear wheel drive |
| Number of gears | 5 |
| Type of gearbox | Automatic transmission |
| 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 728i was powered by the M52B28, a 2.8-liter inline-six engine. This engine was a descendant of the M50 and M52 families, known for their smooth operation and reliability. The M52B28 featured a cast iron block with an aluminum cylinder head, dual overhead camshafts (DOHC), and four valves per cylinder. Fuel delivery was handled by a Bosch Motronic multi-port fuel injection system, optimizing fuel efficiency and power output. The engine produced 193 horsepower at 5300 rpm and 280 Nm (206.52 lb-ft) of torque at 3500 rpm. The 728i utilized a 5-speed automatic transmission, providing smooth and convenient gear changes. This transmission was specifically tuned to complement the engine’s torque curve, prioritizing comfort and ease of driving over outright performance.
Driving Characteristics
The 728i automatic offered a comfortable and refined driving experience. While not as quick as the higher-powered 740i or 750iL, it provided adequate acceleration for everyday driving and highway cruising. The automatic transmission, while smooth, did result in some power loss compared to the available 5-speed manual. The gear ratios were optimized for fuel efficiency and relaxed cruising, meaning the engine didn’t always feel particularly responsive during quick overtaking maneuvers. The 728i’s weight of approximately 1710 kg (3769.9 lbs) contributed to a slightly less agile feel compared to lighter competitors. However, the well-tuned suspension and steering provided a composed and stable ride.
Equipment & Trim Levels
The 728i came standard with a comprehensive list of features befitting a luxury sedan. This included leather upholstery, power-adjustable front seats with memory function, automatic climate control, a premium sound system, and a sunroof. Optional extras included rear seat entertainment, upgraded leather options, parking sensors, and a navigation system. The interior trim was typically finished in wood or aluminum accents, adding to the sense of luxury. The standard exterior features included alloy wheels, fog lights, and a subtle rear spoiler.
Chassis & Braking
The E38 7 Series featured an independent suspension system with wishbone front suspension and an inclined lever rear suspension. This setup provided a comfortable ride while maintaining good handling characteristics. The 728i was equipped with ventilated disc brakes on the front wheels and solid disc brakes on the rear. Anti-lock Braking System (ABS) was standard, enhancing safety and control during emergency braking situations. The steering was a rack-and-pinion system with hydraulic power assistance, providing precise and responsive steering feel.
Market Reception & Comparison
The 728i was generally well-received by automotive critics as a sensible and refined entry point into the 7 Series range. It was praised for its comfortable ride, spacious interior, and comprehensive list of standard features. However, some critics noted that the engine lacked the outright performance of the larger displacement models. Compared to the 730i, the 728i offered a lower price point but sacrificed some horsepower and torque. The 728i’s fuel economy was respectable for a large luxury sedan, averaging around 23.5 US mpg in combined driving. Reliability was generally good, although like all complex vehicles, the E38 7 Series could be prone to age-related issues.
Legacy
The BMW E38 728i remains a sought-after classic among BMW enthusiasts. The M52B28 engine is known for its durability and relatively straightforward maintenance. While finding well-maintained examples can be challenging, the 728i offers a compelling combination of luxury, comfort, and reliability. Today, these cars are often purchased by collectors and enthusiasts who appreciate their classic styling and driving experience. Common issues to look for include cooling system components, suspension bushings, and electrical gremlins. Despite its age, the E38 728i continues to represent a high point in BMW’s engineering and design history.
