The 2016 Infiniti QX50 is widely regarded as one of the most reliable luxury compact SUVs of its era, primarily due to its use of the time-tested 3.7-liter V6 engine and a mature mechanical platform. Now a decade old in 2026, this model remains a favorite in the used market because it lacks the complex turbochargers and finicky electronic transmissions found in newer, more troublesome competitors.
The Mechanical Foundation: The VQ37VHR Engine
To understand the reliability of the 2016 Infiniti QX50, one must first examine its heart: the 3.7-liter V6 engine, internally known as the VQ37VHR. By the time this engine was placed into the 2016 model, Nissan (Infiniti’s parent company) had been refining the VQ engine series for over two decades. This particular iteration was the pinnacle of that development, producing 325 horsepower without the need for forced induction.
From a long-term reliability standpoint, the absence of a turbocharger is a significant advantage. Turbocharged engines, which became the industry standard shortly after 2016, operate under much higher heat and pressure, often leading to oil leaks, cooling system failures, and expensive turbo replacements as they age. The naturally aspirated VQ37VHR avoids these pitfalls.
One historical concern with earlier versions of this engine (roughly 2008–2012) was the internal "gallery gaskets." These gaskets were originally made of a paper-based material that could fail, leading to a drop in oil pressure and potentially catastrophic engine damage. However, by the 2016 model year, Infiniti had switched to reinforced metal gaskets, effectively eliminating this major mechanical "time bomb." Owners of the 2016 model can generally expect the engine block and internals to last well beyond 200,000 miles if basic oil changes are performed regularly.
Transmission and Drivetrain Durability
The 2016 QX50 utilizes a JATCO-sourced 7-speed automatic transmission. While JATCO is sometimes criticized for its continuously variable transmissions (CVTs) used in smaller Nissan vehicles, the traditional torque-converter 7-speed found in the QX50 is a much sturdier unit.
In the decade since its release, this transmission has proven to be robust, provided the fluid is maintained. A common observation among high-mileage owners is that the transmission can occasionally feel "indecisive" or exhibit a slight lag during downshifts—a characteristic often referred to as "gear hunting." This is typically a software tuning choice rather than a mechanical defect.
For the all-wheel-drive (AWD) variants, Infiniti employed the ATTESA E-TS system. This system is rear-wheel-drive biased, only sending power to the front wheels when slip is detected. Because it is not a full-time "heavy-duty" off-road system, it experiences less wear and tear during normal highway commuting. The transfer cases and rear differentials on these models are known for their longevity, though they do require fluid inspections every 30,000 to 60,000 miles to prevent bearing wear.
Common Problems and Known Weaknesses
Despite its overall stellar reputation, the 2016 Infiniti QX50 is not without its specific quirks and maintenance requirements. As these vehicles age into 2026, several "wear-and-tear" patterns have emerged that prospective buyers should monitor.
Suspension and Chassis Components
The QX50 is built on the Infiniti FM (Front Midship) platform, the same architecture used for the sport-focused G37 and Q50 sedans. While this provides excellent handling, the QX50 is a heavier vehicle. This extra weight puts significant stress on the front control arm bushings and ball joints. It is common for these components to require replacement between 80,000 and 120,000 miles. Symptoms of failure include a "clunking" sound over bumps or a slight vibration in the steering wheel at highway speeds.
Cooling System Aging
Like many vehicles from the mid-2010s, the 2016 QX50 uses several plastic components in its cooling system, including the radiator tanks and the heater hose connector. Over ten years of heat cycles, these plastic parts can become brittle. A frequent failure point is the plastic heater hose connector located near the firewall, which can snap and cause a sudden loss of coolant. Many owners proactively replace this with an aluminum aftermarket version to ensure long-term reliability.
Interior Electronics and Infotainment
The technology in the 2016 QX50 was considered "dated" even at the time of its release. Ironically, this is a benefit for reliability. The system uses physical buttons and a relatively simple screen interface, avoiding the "black screen" and software freezing issues that plague newer, touch-screen-heavy luxury vehicles. The most common electronic issues are:
- Backup Camera Failure: Occasionally, the wiring harness in the tailgate can fray, or the camera lens can become clouded.
- Steering Column Adjustment: The motorized tilt/telescoping steering column can sometimes strip its plastic gears, resulting in a column that no longer moves.
Maintenance Schedule and Estimated Costs
Maintaining a 2016 Infiniti QX50 is generally more affordable than maintaining its European counterparts from BMW or Mercedes-Benz. Because it shares many mechanical parts with the Nissan 370Z and Nissan Pathfinder, parts are widely available and relatively inexpensive.
| Component | Maintenance Interval | Estimated Cost (2026 Pricing) |
|---|---|---|
| Engine Oil & Filter | Every 5,000–7,500 miles | $80 – $120 |
| Transmission Fluid | Every 60,000 miles | $250 – $400 |
| Spark Plugs (Iridium) | Every 105,000 miles | $300 – $500 |
| Front Control Arms | As needed (typically 100k+ miles) | $600 – $900 |
| Brake Pads & Rotors | Every 30,000–50,000 miles | $400 – $700 per axle |
| Coolant Flush | Every 100,000 miles | $150 – $250 |
High-mileage owners should also be aware of the valve cover gaskets. It is not uncommon for minor oil seeps to develop around the 120,000-mile mark. While not a "breakdown" level threat, these leaks should be addressed to prevent oil from dripping onto the exhaust manifolds or fouling the spark plug wells.
Safety Ratings and Recall History
Safety is a core component of overall vehicle reliability, as it relates to the integrity of the vehicle's design under stress. The 2016 Infiniti QX50 performed well in contemporary testing. According to the Insurance Institute for Highway Safety (IIHS), the 2016 model received "Good" ratings in most crashworthiness categories. It is important to note that because the 2016 model was an "extended" version of the previous EX37, it benefited from a longer wheelbase that slightly improved its stability and rear-occupant protection.
Regarding recalls, the 2016 QX50 has a relatively clean record compared to its peers. The most notable recalls involved the steering and airbag systems:
- Steering Column: Some units were recalled for a manufacturing defect in the steering shaft that could cause a loss of steering control.
- Airbag Sensors: Issues with the Occupant Classification System (OCS) could lead to the front passenger airbag failing to deploy.
Before purchasing a used 2016 QX50, owners should verify that these recalls were performed by checking the VIN on the NHTSA official website.
The "Stretch" and Its Impact on Reliability
The 2016 model year was a transitional one for the QX50. Infiniti increased the wheelbase by 3.2 inches to address the primary complaint of previous years: a cramped rear seat. This change involved lengthening the prop shaft and the exhaust system.
From a reliability perspective, this "stretch" was executed flawlessly. Because the core drivetrain remained the same, the modification did not introduce new mechanical vulnerabilities. However, it did change the driving dynamics slightly, making the car feel more like a grand tourer and less like a nimble sport sedan. For owners, this meant slightly more predictable tire wear compared to the shorter, more aggressive setup of the 2014–2015 models.
2016 vs. Subsequent Generations (The Reliability Gap)
In 2019, Infiniti redesigned the QX50 completely, replacing the V6 engine with a 2.0-liter Variable Compression Turbo (VC-Turbo) engine and swapping the 7-speed automatic for a CVT.
From a reliability standpoint, the 2016 model is arguably superior to the 2019+ models. The VC-Turbo engine is an incredibly complex piece of engineering that has faced several teething issues, including sensor failures and oil consumption. Furthermore, the CVT in the newer generation does not have the same torque-handling reputation as the 2016's 7-speed traditional automatic. For those prioritizing "bulletproof" long-term ownership, the 2016 (and its 2017 sibling) represents the "Goldilocks" era of the QX50—modern enough to be comfortable, but old enough to be simple and sturdy.
Frequently Asked Questions
Does the 2016 Infiniti QX50 require premium fuel?
Yes, Infiniti recommends premium 91-octane gasoline for the 3.7L V6. While the engine's knock sensors can adjust for lower octane fuel in an emergency, long-term use of regular gas can lead to reduced power, lower fuel economy, and potential carbon buildup on the valves. Given the engine's high compression ratio, premium fuel is a "reliability insurance policy" for the VVEL (Variable Valve Event and Lift) system.
How many miles can a 2016 Infiniti QX50 last?
With proper maintenance, it is common to see these vehicles reach 200,000 to 250,000 miles. The VQ37 engine is frequently used in high-performance applications and is over-engineered for the demands of a compact SUV. The main limiting factor for longevity is usually the suspension bushings and the aging of plastic cooling components rather than the engine or transmission themselves.
Is the 2016 Infiniti QX50 expensive to insure?
As of 2026, insurance rates for the 2016 QX50 are generally moderate. It is classified as a luxury vehicle, which can slightly bump premiums, but its high safety marks and the availability of parts keep costs lower than more exotic European SUVs.
Are there any "deal-breaker" issues with this year?
There are no major mechanical deal-breakers for the 2016 model year. The most significant "issue" is the dated fuel economy (roughly 17 MPG city / 24 MPG highway) and the aging infotainment system. If you can overlook the thirst for fuel and the 2016-era tech, the mechanical reliability is among the best in the class.
Final Recommendation for 2026 Buyers
The 2016 Infiniti QX50 stands as a testament to the "old way" of building luxury SUVs—relying on displacement and mechanical simplicity rather than small engines and high-pressure turbos. If you are looking for a used luxury vehicle that prioritizes mechanical longevity over the latest digital gadgets, this is an excellent choice.
Next Steps for Buyers:
- Inspect the heater hose connector: Ensure it has been replaced or is not showing signs of white crusty residue (coolant leaks).
- Test the steering column: Operate the tilt/telescope function to ensure the motors are not grinding.
- Check Service Records: Prioritize vehicles with a history of 5,000-mile oil changes and at least one transmission fluid service.
- Listen for Suspension Noise: Take a test drive over speed bumps to check for clunking in the front end.
By following these steps, you can secure a vehicle that provides a luxurious driving experience with the maintenance predictability of a much more basic commuter car.
