The BMW X3 (F25 LCI), specifically the 35i xDrive Steptronic variant, represents a mid-cycle refresh of the second-generation X3, produced from 2014 to 2017. This model aimed to enhance the X3’s appeal with updated styling, improved technology, and refined engine options. Positioned as a premium compact SUV, the 35i trim sat towards the higher end of the X3 lineup, offering a significant performance upgrade over the base 28i model while remaining more accessible than the performance-focused X3 M. The F25 LCI continued BMW’s strategy of offering a practical yet luxurious SUV for the North American and European markets, competing with vehicles like the Audi Q5 and Mercedes-Benz GLK.
Technical Specifications
| Brand | BMW |
| Model | X3 |
| Generation | X3 (F25 LCI, facelift 2014) |
| Type | 35i (306 Hp) xDrive Steptronic |
| Start of production | 2014 |
| End of production | 2017 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 10.7 l/100 km (22 US mpg, 26.4 UK mpg, 9.3 km/l) |
| Fuel consumption (extra urban) | 6.9 l/100 km (34.1 US mpg, 40.9 UK mpg, 14.5 km/l) |
| Fuel consumption (combined) | 8.3 l/100 km (28.3 US mpg, 34 UK mpg, 12 km/l) |
| CO2 emissions | 193 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.6 sec |
| Acceleration 0 – 62 mph | 5.6 sec |
| Acceleration 0 – 60 mph | 5.3 sec |
| Maximum speed | 245 km/h (152.24 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 5.9 kg/Hp, 168.6 Hp/tonne |
| Weight-to-torque ratio | 4.5 kg/Nm, 220.4 Nm/tonne |
| Power | 306 Hp @ 5800-6400 rpm |
| Power per litre | 102.7 Hp/l |
| Torque | 400 Nm @ 1200-5000 rpm (295.02 lb.-ft. @ 1200-5000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N55B30A |
| Engine displacement | 2979 cm3 (181.79 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 89.6 mm (3.53 in.) |
| Compression ratio | 10.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 9.6 l (10.14 US qt | 8.45 UK qt) |
| Kerb Weight | 1815 kg (4001.39 lbs.) |
| Max. weight | 2405 kg (5302.12 lbs.) |
| Max load | 590 kg (1300.73 lbs.) |
| Trunk (boot) space – minimum | 550 l (19.42 cu. ft.) |
| Trunk (boot) space – maximum | 1600 l (56.5 cu. ft.) |
| Fuel tank capacity | 67 l (17.7 US gal | 14.74 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (12%) | 2400 kg (5291.09 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 100 kg (220.46 lbs.) |
| Length | 4657 mm (183.35 in.) |
| Width | 1881 mm (74.06 in.) |
| Height | 1661 mm (65.39 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1594 mm (62.76 in.) |
| Rear (Back) track | 1610 mm (63.39 in.) |
| Ride height (ground clearance) | 204 mm (8.03 in.) |
| Drag coefficient (Cd) | 0.35 |
| Minimum turning circle (turning diameter) | 11.9 m (39.04 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission |
| Front suspension | Independent coil spring |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 245/50 R18 100W |
| Wheel rims size | 8.0J x 18 |
Powertrain & Engine Architecture
The heart of the X3 35i is BMW’s N55B30A engine, a 3.0-liter inline-six cylinder engine. This engine is a direct descendant of the N54, but replaces the N54’s twin-turbo setup with a single, twin-scroll turbocharger. This change aimed to improve responsiveness and reliability. The N55 utilizes direct fuel injection, ensuring precise fuel delivery for optimal combustion and efficiency. Valvetrain is double overhead camshafts (DOHC) with four valves per cylinder, contributing to its high power output. The engine produces 306 horsepower at 5800-6400 rpm and 400 Nm (295 lb-ft) of torque between 1200-5000 rpm. Paired with the engine is BMW’s 8-speed Steptronic automatic transmission, known for its smooth shifts and efficiency. This transmission features a torque converter and allows for manual gear selection via steering wheel-mounted paddles or the gear selector.
Driving Characteristics
The X3 35i xDrive Steptronic delivers a noticeably more engaging driving experience than the base 28i model. The increased horsepower and torque, combined with the quick-shifting 8-speed automatic, result in brisk acceleration – 0 to 60 mph in approximately 5.3 seconds. The xDrive all-wheel-drive system provides excellent traction in various conditions, enhancing stability and confidence. While the automatic transmission is generally smooth and responsive, it doesn’t offer the same level of driver engagement as a manual transmission. The gear ratios are tuned for a balance between performance and fuel economy, with taller gears for highway cruising and shorter gears for quicker acceleration. Compared to the 28i, the 35i feels more confident when passing or merging onto highways.
Equipment & Trim Levels
The X3 35i typically came well-equipped as standard. Common features included leatherette upholstery, power-adjustable front seats, a 9-speaker audio system, BMW’s iDrive infotainment system with a 6.5-inch display, automatic climate control, and parking sensors. Optional extras were plentiful, including a premium sound system, navigation, heated seats, a panoramic sunroof, and various driver-assistance features like lane departure warning and blind-spot monitoring. Interior trim options ranged from wood to aluminum, allowing buyers to personalize the cabin. The xDrive Steptronic designation specifically indicates the inclusion of the 8-speed automatic transmission and the xDrive all-wheel-drive system.
Chassis & Braking
The X3 35i utilizes a robust chassis with an independent coil spring suspension in the front and an independent multi-link suspension in the rear. This setup provides a comfortable ride while maintaining good handling characteristics. The 35i typically featured larger brakes than the 28i, with ventilated discs at all four corners, providing ample stopping power. The xDrive all-wheel-drive system distributes power between the front and rear axles as needed, optimizing traction and stability. Stabilizer bars are present at both the front and rear to reduce body roll during cornering.
Market Reception & Comparison
The X3 35i was generally well-received by automotive critics. It was praised for its powerful engine, comfortable ride, and luxurious interior. However, some reviewers noted that the steering lacked the feedback found in some competitors. Compared to the X3 28i, the 35i offered a significant performance boost, justifying the higher price tag for buyers prioritizing acceleration and overall driving experience. Fuel economy was respectable for its class, averaging around 28.3 US mpg in combined driving. Reliability was generally good, although some owners reported minor issues with the cooling system and oil leaks over time.
Legacy
The N55 engine, found in the X3 35i, has proven to be a relatively reliable powerplant when properly maintained. While not immune to issues like oil leaks and carbon buildup, it’s generally considered more durable than its predecessor, the N54. Today, used X3 35i models represent a good value for buyers seeking a premium compact SUV with strong performance. Regular maintenance, including oil changes and inspections of the cooling system, is crucial for ensuring long-term reliability. The F25 LCI X3 35i remains a popular choice in the used car market due to its blend of luxury, performance, and practicality.
