The BMW 725i, produced between 1983 and 1986, was a key variant within the E23 generation of the 7 Series. Introduced as part of the facelifted E23 line, it offered a more accessible entry point into BMW’s flagship sedan range, positioned below the more powerful 733i and 745i models. This version aimed to balance luxury and performance with a focus on fuel efficiency, particularly important as the 1980s progressed. The 725i represented BMW’s attempt to broaden the appeal of the 7 Series, offering a sophisticated driving experience without the higher price tag of its larger-engined siblings.
Technical Specifications
| Brand | BMW |
| Model | 7 Series |
| Generation | 7 Series (E23, facelift 1983) |
| Type (Engine) | 725i (150 Hp) Automatic |
| Start of production | 1983 |
| End of production | 1986 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 9.9 kg/Hp, 100.7 Hp/tonne |
| Weight-to-torque ratio | 6.9 kg/Nm, 144.3 Nm/tonne |
| Power | 150 Hp @ 5500 rpm |
| Power per litre | 60.1 Hp/l |
| Torque | 215 Nm @ 4000 rpm, 158.58 lb.-ft. @ 4000 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M30B25 |
| Engine displacement | 2494 cm3, 152.19 cu. in. |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm, 3.31 in. |
| Piston Stroke | 75 mm, 2.95 in. |
| Compression ratio | 9.6:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | SOHC |
| Engine oil capacity | 5.75 l, 6.08 US qt | 5.06 UK qt |
| Kerb Weight | 1490 kg, 3284.89 lbs |
| Max. weight | 1980 kg, 4365.15 lbs |
| Max load | 490 kg, 1080.27 lbs |
| Trunk (boot) space – minimum | 480 l, 16.95 cu. ft |
| Fuel tank capacity | 100 l, 26.42 US gal | 22 UK gal |
| Length | 4860 mm, 191.34 in |
| Width | 1800 mm, 70.87 in |
| Height | 1430 mm, 56.3 in |
| Wheelbase | 2795 mm, 110.04 in |
| Front track | 1502 mm, 59.13 in |
| Rear (Back) track | 1524 mm, 60 in |
| Drag coefficient (Cd) | 0.40 |
| Minimum turning circle (turning diameter) | 11.6 m, 38.06 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 | 4 gears, automatic transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Tires size | 195/70 HR 14 |
| Wheel rims size | 14 |
Powertrain & Engine Architecture
The heart of the 725i was the M30B25 engine, a 2.5-liter inline-six cylinder powerplant. This engine was a development of the well-regarded M30 family, known for its smoothness and durability. The B25 featured multi-port fuel injection, a significant upgrade over the carburetors used in earlier M30 variants, improving both performance and fuel efficiency. The single overhead camshaft (SOHC) design kept the engine relatively simple, contributing to its reliability. The engine produced 150 horsepower at 5500 rpm and 215 Nm (158.58 lb-ft) of torque at 4000 rpm. This power was delivered to the rear wheels through a four-speed automatic transmission, a common pairing for this trim level. The automatic transmission was chosen to provide a more comfortable and convenient driving experience, appealing to buyers who prioritized ease of use over outright performance.
Driving Characteristics
The 725i automatic offered a comfortable and refined driving experience. While not as quick as the 733i or 745i, the 2.5-liter engine provided adequate power for everyday driving. The automatic transmission, while smooth, did slightly diminish acceleration compared to the available manual gearbox. The gear ratios were tuned for fuel economy and relaxed cruising, rather than aggressive acceleration. The car felt composed on the highway, with good stability and a comfortable ride. However, drivers seeking a more engaging experience might find the automatic transmission and relatively modest power output somewhat lacking. Compared to the 733i, the 725i felt noticeably slower, especially during overtaking maneuvers. The 725i’s focus was on providing a luxurious and comfortable experience, rather than outright sporting performance.
Equipment & Trim Levels
The 725i came reasonably well-equipped, reflecting its status as a luxury sedan. Standard features typically included power windows, power locks, air conditioning, and a high-quality sound system. The interior was typically trimmed with cloth upholstery, although leather was available as an option. The dashboard layout was typical of BMW in the 1980s, with a driver-focused design and clear instrumentation. Optional extras included a sunroof, upgraded sound systems, and more luxurious leather upholstery. The 725i was often seen as a more affordable way to experience the 7 Series’ luxury features, making it a popular choice for buyers who wanted a premium sedan without the highest price tag.
Chassis & Braking
The E23 7 Series featured an independent suspension on all four wheels. The front suspension utilized a McPherson strut design with coil springs and an anti-roll bar, while the rear suspension employed an independent coil spring setup. This suspension configuration provided a comfortable ride and good handling characteristics. The 725i was equipped with ventilated disc brakes at the front and solid disc brakes at the rear, providing adequate stopping power for its weight class. The steering was power-assisted, making it easy to maneuver in city driving. The chassis was designed to provide a balance between comfort and handling, prioritizing a smooth ride over razor-sharp cornering.
Market Reception & Comparison
The 725i was generally well-received by automotive critics as a sensible and well-rounded luxury sedan. It was praised for its comfortable ride, refined interior, and fuel efficiency. However, some critics noted that its performance was not as exhilarating as that of the larger-engined 7 Series models. Compared to the 733i, the 725i offered a lower price point but sacrificed some performance. The 725i’s fuel economy was a key selling point, particularly in the context of the 1980s energy crisis. It was seen as a more practical choice for buyers who did a lot of city driving or long-distance cruising.
Legacy
The M30B25 engine and the associated automatic transmission have proven to be relatively reliable over the long term, provided they are properly maintained. The engine is known for its durability and ability to withstand high mileage. However, like any classic BMW, the 725i requires regular maintenance to keep it in good condition. Today, the 725i is a sought-after classic car, particularly among BMW enthusiasts. It represents a well-preserved example of 1980s German engineering, offering a unique blend of luxury, comfort, and reliability. Values for well-maintained examples have been steadily increasing in recent years, reflecting the growing demand for classic BMWs.
