The Infiniti QX50, specifically the facelifted first generation produced from 2015 to 2016, represented Infiniti’s entry into the mid-size luxury crossover SUV segment. This iteration, powered by the 2.5-liter V6 engine paired with an all-wheel-drive system and a seven-speed automatic transmission, aimed to balance performance, comfort, and practicality for the North American market. Positioned as a competitor to vehicles like the Acura RDX and Lexus RX, the QX50 offered a more driver-focused experience than some of its rivals, while still providing the expected luxury features. This particular configuration was a mid-range offering, slotting below potential future higher-performance trims and offering a more accessible price point than some of the more heavily optioned models.
Technical Specifications
| Brand | Infiniti |
| Model | QX50 |
| Generation | QX50 I (facelift 2015) |
| Type (Engine) | 2.5 V6 (222 Hp) AWD Automatic |
| Start of production | 2015 |
| End of production | 2016 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 14.6 l/100 km (16.1 US mpg, 19.3 UK mpg, 6.8 km/l) |
| Fuel consumption (extra urban) | 8.5 l/100 km (27.7 US mpg, 33.2 UK mpg, 11.8 km/l) |
| Fuel consumption (combined) | 10.7 l/100 km (22 US mpg, 26.4 UK mpg, 9.3 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 | 206 km/h (128 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 8.3 kg/Hp, 120.5 Hp/tonne |
| Weight-to-torque ratio | 7.3 kg/Nm, 136.7 Nm/tonne |
| Power | 222 Hp @ 6400 rpm |
| Power per litre | 88.9 Hp/l |
| Torque | 252 Nm @ 4800 rpm (185.87 lb.-ft. @ 4800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | VQ25HR |
| Engine displacement | 2496 cm3 (152.32 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 85 mm (3.35 in.) |
| Piston Stroke | 73.3 mm (2.89 in.) |
| Compression ratio | 10.3:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 4.7 l (4.97 US qt | 4.14 UK qt) |
| Coolant capacity | 8.4 l (8.88 US qt | 7.39 UK qt) |
| Kerb Weight | 1843 kg (4063.12 lbs.) |
| Max. weight | 2305 kg (5081.66 lbs.) |
| Max load | 462 kg (1018.54 lbs.) |
| Trunk (boot) space – minimum | 309 l (10.91 cu. ft.) |
| Fuel tank capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Length | 4745 mm (186.81 in.) |
| Width | 1800 mm (70.87 in.) |
| Height | 1613 mm (63.5 in.) |
| Wheelbase | 2880 mm (113.39 in.) |
| Front track | 1535 mm (60.43 in.) |
| Rear (Back) track | 1550 mm (61.02 in.) |
| Ride height (ground clearance) | 165 mm (6.5 in.) |
| Drag coefficient (Cd) | 0.33 |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 7 gears, automatic transmission |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| 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 | 225/55 R18; 245/45 R19 |
| Wheel rims size | 18; 19 |
Powertrain & Engine Architecture
The heart of the 2015-2016 Infiniti QX50 2.5 V6 AWD was the VQ25HR 2.5-liter V6 engine. This engine, part of Nissan’s well-regarded VQ family, featured a 60-degree V-angle and utilized a dual overhead camshaft (DOHC) design with four valves per cylinder. The “HR” designation signified “High Revolution,” indicating a focus on higher engine speeds and improved breathing. Direct fuel injection was employed to enhance efficiency and power output. The engine produced 222 horsepower at 6400 rpm and 252 Nm (185.87 lb-ft) of torque at 4800 rpm. This power was then sent to all four wheels via a seven-speed automatic transmission. This transmission, while providing smooth shifts, wasn’t known for being particularly sporty or quick to respond compared to some dual-clutch transmissions available in competing vehicles. The all-wheel-drive system was primarily reactive, meaning it typically operated in front-wheel drive and engaged the rear wheels when slippage was detected.
Driving Characteristics
The QX50 2.5L Automatic delivered a comfortable and composed driving experience. Acceleration from 0-60 mph took around 9 seconds, which was adequate for everyday driving but not particularly exhilarating. The seven-speed automatic transmission, while smooth, sometimes felt hesitant during quick acceleration maneuvers. The gear ratios were tuned more for fuel efficiency and relaxed cruising than for outright performance. Compared to the potential for a more powerful V6 or a hybrid powertrain (offered in some markets), this configuration prioritized fuel economy and affordability. The all-wheel-drive system provided enhanced traction in inclement weather, making it a capable vehicle for all-season use.
Equipment & Trim Levels
The 2015-2016 QX50 2.5 V6 AWD typically came standard with features such as leather upholstery, power-adjustable front seats, a rearview camera, a 7-inch touchscreen display, and Bluetooth connectivity. Available options included a navigation system, a premium audio system, and various driver-assistance features like blind-spot monitoring and lane departure warning. Interior trim levels varied, with higher trims offering wood accents and more luxurious materials. The dashboard layout was generally considered functional and well-designed, though some critics found it to be somewhat dated compared to newer competitors.
Chassis & Braking
The QX50 utilized a front double wishbone and rear independent multi-link suspension system, providing a comfortable ride quality. Stabilizer bars were included at both ends to reduce body roll during cornering. Braking duties were handled by ventilated discs on all four wheels, coupled with an anti-lock braking system (ABS). The braking performance was adequate for the vehicle’s weight and power, but not exceptional. The steering was electrically assisted, providing a light and easy feel, though it lacked the feedback of a hydraulic system.
Market Reception & Comparison
The QX50 2.5L Automatic received mixed reviews. Critics praised its comfortable ride, spacious interior, and standard features. However, they also noted its relatively slow acceleration, somewhat dated interior design, and less-than-stellar fuel economy compared to some competitors. The fuel economy averaged around 22 mpg combined, which was typical for a V6-powered crossover of its size, but not class-leading. Compared to the Acura RDX, the QX50 offered a more luxurious interior but less engaging driving dynamics. Against the Lexus RX, it provided a more driver-focused experience but lacked the Lexus’s reputation for reliability and refinement.
Legacy
The VQ25HR engine, in general, has proven to be a relatively reliable powerplant, though regular maintenance is crucial. Common issues with the QX50 2.5L Automatic include potential oil consumption as the engine ages and occasional transmission glitches. The all-wheel-drive system is generally robust, but regular fluid changes are recommended. On the used car market, the 2015-2016 QX50 2.5 V6 AWD represents a relatively affordable entry point into the luxury crossover segment. Its comfortable ride and spacious interior continue to appeal to buyers seeking a practical and well-equipped vehicle, but potential buyers should be aware of the potential maintenance costs associated with a higher-mileage example.
