The BMW X5 (E53 LCI) 4.8is Steptronic, produced from 2004 to 2006, represented the performance pinnacle of the first-generation X5 series. The “LCI” designation refers to the Life Cycle Impulse, or facelift, which brought styling updates and mechanical refinements to the E53 platform. Positioned as the flagship trim, the 4.8is offered a substantial increase in power and luxury compared to the 3.0i and 4.4i models, targeting buyers seeking a sporty and capable luxury SUV. It was BMW’s answer to high-performance SUVs like the Porsche Cayenne and Mercedes-Benz ML55 AMG, offering a blend of on-road performance and all-weather capability.
Technical Specifications
| Brand | BMW |
| Model | X5 |
| Generation | X5 (E53 LCI, facelift 2003) |
| Type (Engine) | 4.8is (360 Hp) Steptronic |
| Start of production | 2004 |
| End of production | 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (economy) – urban | 18.7 l/100 km (12.6 US mpg, 15.1 UK mpg, 5.3 km/l) |
| Fuel consumption (economy) – extra urban | 10.5 l/100 km (22.4 US mpg, 26.9 UK mpg, 9.5 km/l) |
| Fuel consumption (economy) – combined | 13.5 l/100 km (17.4 US mpg, 20.9 UK mpg, 7.4 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.1 sec |
| Acceleration 0 – 62 mph | 6.1 sec |
| Acceleration 0 – 60 mph | 5.8 sec |
| Maximum speed | 246 km/h (152.86 mph) |
| Weight-to-power ratio | 6.1 kg/Hp, 163.6 Hp/tonne |
| Weight-to-torque ratio | 4.5 kg/Nm, 222.7 Nm/tonne |
| Power | 360 Hp @ 6200 rpm |
| Power per litre | 75 Hp/l |
| Torque | 490 Nm @ 3600 rpm (361.41 lb.-ft. @ 3600 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N62B48 |
| Engine displacement | 4799 cm3 (292.85 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 93 mm (3.66 in.) |
| Piston Stroke | 88.3 mm (3.48 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant | 13 l (13.74 US qt | 11.44 UK qt) |
| Kerb Weight | 2200 kg (4850.17 lbs.) |
| Max. weight | 2700 kg (5952.48 lbs.) |
| Max load | 500 kg (1102.31 lbs.) |
| Trunk (boot) space – minimum | 465 l (16.42 cu. ft.) |
| Trunk (boot) space – maximum | 1550 l (54.74 cu. ft.) |
| Fuel tank capacity | 93 l (24.57 US gal | 20.46 UK gal) |
| Length | 4667 mm (183.74 in.) |
| Width | 1872 mm (73.7 in.) |
| Width including mirrors | 2180 mm (85.83 in.) |
| Height | 1707 mm (67.2 in.) |
| Wheelbase | 2820 mm (111.02 in.) |
| Front track | 1576 mm (62.05 in.) |
| Rear (Back) track | 1576 mm (62.05 in.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 gears, automatic transmission |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| 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 | 275/40 R20 |
| Wheel rims size | 20 |
Powertrain & Engine Architecture
The heart of the X5 4.8is is the N62B48 engine, a 4.8-liter naturally aspirated V8. This engine is a significant departure from the 4.4-liter V8 found in the standard X5 4.4i. The N62 featured aluminum construction, double overhead camshafts (DOHC) with four valves per cylinder, and a relatively high 11:1 compression ratio. Fuel delivery was handled by a multi-port fuel injection system. The engine produced 360 horsepower at 6200 rpm and 490 Nm (361 lb-ft) of torque at 3600 rpm. The “Steptronic” transmission refers to BMW’s 6-speed automatic gearbox, known for its smooth shifts and ability to adapt to driving conditions. This transmission offered both fully automatic operation and a manual shift mode for more driver control.
Driving Characteristics
The 4.8is delivered a noticeably more engaging driving experience than its siblings. The increased power and torque resulted in brisk acceleration – 0 to 60 mph in around 5.8 seconds – making it one of the quickest SUVs of its time. The automatic transmission, while smooth, was tuned for performance, holding gears longer and downshifting quickly under throttle. Compared to the 3.0i, the 4.8is offered significantly more power, but at the cost of fuel economy. Against the 4.4i, the 4.8is provided a more refined and powerful experience, justifying its higher price tag. The all-wheel-drive system provided excellent traction in various conditions, enhancing stability and control.
Equipment & Trim Levels
The 4.8is came standard with a generous array of features, befitting its flagship status. Interior appointments included leather upholstery, power-adjustable heated front seats with memory function, automatic climate control, and a premium sound system. Standard exterior features included 20-inch alloy wheels, parking sensors, and xenon headlights. Optional extras included a navigation system, upgraded leather trim, rear-seat entertainment, and active suspension. The interior trim was typically finished with wood or aluminum accents, adding to the luxurious feel.
Chassis & Braking
The X5 4.8is utilized a robust chassis with a double wishbone front suspension and an independent multi-link rear suspension. This setup provided a comfortable ride while maintaining good handling characteristics. Brakes consisted of ventilated discs at all four corners, providing ample stopping power. The anti-lock braking system (ABS) was standard, enhancing safety and control during emergency braking. The suspension was tuned to balance comfort and handling, offering a more sporty feel than the standard X5 models.
Market Reception & Comparison
The X5 4.8is was generally well-received by automotive critics, who praised its powerful engine, refined interior, and capable handling. However, its fuel economy was often criticized, as expected for a vehicle of its size and performance. Compared to the 3.0i, the 4.8is offered a significant performance upgrade but came at a substantial price premium. Against the 4.4i, the 4.8is was seen as a more desirable option for buyers prioritizing performance and exclusivity. Reliability was generally good, although the N62 engine was known to be susceptible to coolant leaks and oil consumption issues as it aged.
Legacy
Today, the BMW X5 (E53) 4.8is Steptronic is considered a desirable classic SUV. Well-maintained examples command a premium in the used car market. The N62 engine, while capable, requires diligent maintenance to prevent issues related to coolant leaks and oil consumption. The 6-speed Steptronic transmission is generally reliable, but regular fluid changes are essential. The X5 4.8is remains a compelling option for enthusiasts seeking a blend of luxury, performance, and all-weather capability in a first-generation X5.
