The BMW 5 Series E34 525i 24V Automatic, produced between 1992 and 1995, represents a significant evolution in BMW’s mid-size executive car lineage. Positioned as a mid-range offering within the E34 generation (1988-1996), it bridged the gap between the more affordable 520i and the performance-oriented 530i/540i models. This variant aimed to deliver a balance of refinement, performance, and practicality, appealing to buyers seeking a comfortable and capable grand tourer. The 525i 24V Automatic was a popular choice in European markets and gained a following in North America as a well-rounded luxury sedan.
Technical Specifications
| Brand | BMW |
| Model | 5 Series |
| Generation | 5 Series (E34) |
| Type (Engine) | 525i 24V (192 Hp) Automatic |
| Start of production | 1992 |
| End of production | 1995 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 12.6 l/100 km (18.7 US mpg, 22.4 UK mpg, 7.9 km/l) |
| Fuel consumption (extra urban) | 6.2 l/100 km (37.9 US mpg, 45.6 UK mpg, 16.1 km/l) |
| Fuel consumption (combined) | 8.8 l/100 km (26.7 US mpg, 32.1 UK mpg, 11.4 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 9.5 sec |
| Acceleration 0 – 62 mph | 9.5 sec |
| Acceleration 0 – 60 mph | 9 sec |
| Maximum speed | 225 km/h (139.81 mph) |
| Weight-to-power ratio | 7.9 kg/Hp, 126.7 Hp/tonne |
| Weight-to-torque ratio | 6.1 kg/Nm, 165 Nm/tonne |
| Power | 192 Hp @ 5900 rpm |
| Power per litre | 77 Hp/l |
| Torque | 250 Nm @ 4200 rpm (184.39 lb.-ft. @ 4200 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M50B25TU |
| 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 | 10.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC, VANOS |
| Engine oil capacity | 5.75 l (6.08 US qt | 5.06 UK qt) |
| Coolant | 10.5 l (11.1 US qt | 9.24 UK qt) |
| Kerb Weight | 1515 kg (3340 lbs.) |
| Max. weight | 2025 kg (4464.36 lbs.) |
| Max load | 510 kg (1124.36 lbs.) |
| Trunk (boot) space – minimum | 460 l (16.24 cu. ft.) |
| Fuel tank capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (8%) | 1900 kg (4188.78 lbs.) |
| Permitted trailer load with brakes (12%) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load without brakes | 700 kg (1543.24 lbs.) |
| Length | 4720 mm (185.83 in.) |
| Width | 1751 mm (68.94 in.) |
| Height | 1412 mm (55.59 in.) |
| Wheelbase | 2761 mm (108.7 in.) |
| Front track | 1470 mm (57.87 in.) |
| Rear (Back) track | 1495 mm (58.86 in.) |
| Front overhang | 846 mm (33.31 in.) |
| Rear overhang | 1113 mm (43.82 in.) |
| Minimum turning circle | 11.5 m (37.73 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 5 gears, automatic transmission |
| Front suspension | Independent type McPherson, Transverse stabilizer |
| Rear suspension | Transverse stabilizer, Trailing arm |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Power steering | Hydraulic Steering |
| Tires size | 205/65 R15 |
| Wheel rims size | 6.5J x 15 |
Powertrain & Engine Architecture
The heart of the 525i 24V Automatic is the M50B25TU inline-six engine. This 2.5-liter engine is a naturally aspirated powerplant featuring a cast iron block and an aluminum cylinder head. The “24V” designation refers to the four valves per cylinder, a key upgrade over earlier BMW six-cylinder designs. Fuel delivery is managed by a Bosch Motronic 1.7 multi-port fuel injection system, optimizing for both performance and efficiency. A crucial element of the M50 engine family is the VANOS variable valve timing system, which adjusts the intake camshaft timing to improve low-end torque and high-end power. The automatic transmission used is a 5-speed unit (typically the ZF 5HP18), known for its smooth shifting and reliability. This transmission was specifically tuned to complement the engine’s torque curve, providing comfortable cruising and adequate acceleration.
Driving Characteristics
The 525i 24V Automatic offered a refined driving experience. While not as overtly sporty as the manual transmission or higher-powered variants, the automatic provided effortless cruising and smooth acceleration. The 192 horsepower and 250 Nm (184 lb-ft) of torque were sufficient for confident highway passing and everyday driving. The automatic transmission’s gear ratios were geared towards comfort and fuel economy, resulting in a slightly less responsive feel compared to the 5-speed manual. However, the transmission offered a sport mode which held gears longer, providing more aggressive acceleration when needed. The rear-wheel-drive configuration contributed to balanced handling, although it lacked the all-wheel-drive stability of later BMW models.
Equipment & Trim Levels
The 525i 24V Automatic typically came standard with features such as power windows, power locks, air conditioning, and a basic audio system. Upholstery was usually cloth, although leather was available as an option. Optional extras included a sunroof, heated seats, upgraded audio systems, and automatic climate control. The trim level was generally consistent across the 525i range, with options being the primary way to personalize the vehicle. The interior design was typical of BMW in the early 1990s – functional, well-built, and driver-focused.
Chassis & Braking
The E34 5 Series featured an independent suspension setup, with McPherson struts at the front and a semi-trailing arm suspension at the rear. This configuration provided a comfortable ride and good handling characteristics. The 525i Automatic typically came equipped with ventilated disc brakes at the front and solid discs at the rear. ABS (Anti-lock Braking System) was standard, enhancing safety and stability during hard braking. Stabilizer bars were fitted front and rear to reduce body roll during cornering.
Market Reception & Comparison
The 525i 24V Automatic was generally well-received by automotive critics. It was praised for its smooth engine, comfortable ride, and refined interior. Compared to the 520i, the 525i offered a noticeable performance upgrade. However, the 530i and 540i models provided significantly more power and a sportier driving experience. Fuel economy was reasonable for a vehicle of its class, although it wasn’t as efficient as the 520i or the diesel-powered 525tds. Reliability was generally good, although preventative maintenance was crucial to avoid issues with the VANOS system and cooling system.
Legacy
The BMW E34 525i 24V Automatic has become a sought-after classic among BMW enthusiasts. The M50B25TU engine is known for its durability and tunability, and the automatic transmission, when properly maintained, can provide years of reliable service. Today, well-maintained examples command a premium in the used car market. The E34 5 Series is remembered as a high point in BMW’s engineering and design, offering a compelling blend of luxury, performance, and driving enjoyment. Its enduring appeal lies in its timeless design and the engaging driving experience it provides.
