A Complete Guide to Infiniti’s Model Lineup (and What the Names Mean)
Infiniti’s naming strategy looks random at first glance—QX80, Q50, QX55—but it’s actually a simple two-letter system. Every model is either a Q (sedan/coupe) or a QX (SUV/crossover), followed by a number that roughly signals size and position in the lineup. The higher the number, the larger and more premium the vehicle. That’s the entire code. Once you know it, you can decode any Infiniti on sight, and this guide walks through each current model, what it competes with, and what ownership actually looks like.
The Naming System, Decoded
Infiniti switched to its current naming convention in 2014. Before that, you had names like the G37, M37, FX35, and EX35. The new system is cleaner:
- Q = passenger car (sedans and coupes)
- QX = utility vehicle (SUVs and crossovers)
- The number = relative size and price point
So a Q50 is a midsize sedan, while a QX80 is a full-size SUV. The number doesn’t indicate horsepower, engine size, or model year—it’s purely positional. One exception to remember: the Q60 coupe was discontinued after 2022, so the current car lineup is just the Q50 sedan.
Current Sedan: Infiniti Q50
The Q50 is Infiniti’s only remaining sedan, and it’s been in production since 2014. That’s a long generation by any standard, but it explains why the car is often discounted and why used examples are plentiful.
Engine and specs: The standard Q50 uses a 3.0-liter twin-turbo V6 producing 300 horsepower. The Q50 Red Sport 400 bumps that to 400 horsepower with the same engine, just higher boost and revised tuning. Both versions use a 7-speed automatic and offer rear-wheel drive or all-wheel drive.
What it competes with: The Q50 sits against the BMW 3 Series, Audi A4, Mercedes C-Class, and Genesis G70. Against those, the Q50 is older, but it’s also simpler—fewer electronic nannies, more traditional luxury-sport character.
Who it’s for: If you want a rear-drive-based sport sedan with a proven twin-turbo V6 and don’t need the latest tech, the Q50 is a value pick. If you want the newest driver-assist suite or a modern interior, look elsewhere.
Ownership note: The 3.0T engine has a known belt-driven accessory issue—the serpentine belt tensioner can fail, and the belt can shred. It’s not universal, but it’s worth checking service records on any used Q50. The Red Sport also runs hot in track use; the cooling system is adequate for street driving but marginal for sustained hard laps.
The Crossover and SUV Lineup
Infiniti’s current utility lineup spans five models, from compact to full-size. Here’s how they stack up.
QX50 (Compact Crossover)
The QX50 is Infiniti’s entry-level SUV. It’s a two-row compact crossover that competes with the BMW X3, Audi Q5, Acura RDX, and Lexus NX.
Key detail: The QX50 uses a variable-compression turbocharged 2.0-liter four-cylinder (VC-Turbo) that makes 268 horsepower. The engine can adjust its compression ratio on the fly, which is genuinely clever engineering—it varies between 8:1 (high boost, more power) and 14:1 (efficiency mode). Real-world fuel economy is decent but not class-leading; expect mid-20s mpg combined.
What to know before buying: The CVT (continuously variable transmission) is the weak point in the driving experience. It’s smooth in normal driving, but under hard acceleration it drones and feels rubbery compared to the traditional automatics in rivals. If you’re fine with a relaxed driving character, it’s a comfortable, well-equipped compact. If you want sporty, this isn’t it.
QX55 (Coupe-Styled Compact Crossover)
The QX55 is essentially a QX50 with a sloping roofline and more aggressive styling. It’s Infiniti’s answer to the BMW X4 and Audi Q5 Sportback.
Mechanicals: Same VC-Turbo engine and CVT as the QX50. The difference is almost entirely cosmetic—the rear roofline cuts into cargo space and rear headroom. You’re paying for looks, not utility.
Who it’s for: Buyers who want the QX50’s size but find its styling too conservative. The QX55 is the style-first choice, and it comes standard with more equipment than the base QX50.
QX60 (Three-Row Midsize SUV)
The QX60 is Infiniti’s family hauler. It’s a three-row SUV that competes with the Acura MDX, Lexus TX, and Volvo XC90.
Key detail: The current generation (2022 and newer) dropped the old CVT in favor of a 9-speed automatic. That’s a major improvement—the previous QX60’s CVT had a reputation for reliability complaints, and the newer transmission makes the car drive more conventionally. The engine is a 3.5-liter V6 with 295 horsepower.
Practical notes: The second-row seats slide forward even with a child seat installed, which makes third-row access genuinely easier than in many rivals. The interior is quiet and the ride is soft. It’s not sporty, but it’s a comfortable, well-built family SUV.
QX70 (Discontinued—But Still on the Road)
The QX70 was the old FX crossover, sold from 2013 to 2017 under the QX70 name. It’s worth mentioning because used examples are still popular. It had a 3.7-liter V6 (325 hp) or a 5.0-liter V8 (390 hp) and a truly distinctive, low-slung body.
Buying used: The 3.7 V6 is reliable and sounds good. The V8 is faster but thirstier. Both use a 7-speed automatic. The interior is dated by modern standards, and the ride is firm, but if you want a crossover that drives more like a sports car, the QX70 is a unique pick.
QX80 (Full-Size SUV)
The QX80 is Infiniti’s flagship. It’s a body-on-frame full-size SUV that shares its platform with the Nissan Armada. It competes with the Cadillac Escalade, Lincoln Navigator, and Lexus LX.
Engine and capability: A 5.6-liter V8 with 400 horsepower and 413 lb-ft of torque. It’s a traditional, proven powertrain—no turbocharging, no hybrid assist. Towing capacity is 8,500 pounds, which is strong for the class.
What to know: The QX80 is large, thirsty (expect 13-15 mpg in real driving), and its interior is older than rivals. The current generation dates to 2011, with updates along the way. It’s roomy, comfortable, and genuinely capable off-road in its 4WD form, but it’s the oldest design in the segment.
Who it’s for: Buyers who want a big, simple, V8-powered SUV without the complexity of air suspension or hybrid systems. It’s a straightforward, heavy-duty choice.
Which Infiniti Model Is the Best?
There’s no single “best” Infiniti—it depends on what you need. Here’s a decision framework that changes based on your constraints:
- If you want the most reliable, simplest ownership: The QX60 with the 9-speed automatic (2022+) is the strongest daily driver. The V6 is proven, the transmission is conventional, and the interior is modern.
- If you want the best driving experience: The Q50 Red Sport 400 is the pick. 400 horsepower, rear-wheel drive, and a traditional automatic. It’s the closest thing Infiniti makes to a true sport sedan.
- If you need maximum towing and space: The QX80. Nothing else in the lineup comes close to its 8,500-pound towing capacity.
- If you want the best value used: The Q50 (non-Red Sport) is often heavily depreciated, and the 3.0T engine is solid if maintained. The QX70 with the 3.7 V6 is also a used-market bargain for its driving character.
The constraint that changes the answer: Budget for maintenance and fuel. If you’re cost-sensitive, the QX50 and QX55 with the VC-Turbo four-cylinder are the most fuel-efficient, but the CVT is a long-term question mark. If you’re willing to spend more on gas, the QX60’s V6 and 9-speed is the more robust mechanical package.
Which Infiniti Models to Stay Away From?
Be specific about problem years and known issues:
- 2014-2019 QX60 with the CVT: The earlier CVT units had a documented history of failure, often requiring full transmission replacement. If you’re looking at a used QX60, prioritize 2022 and newer, or budget for a potential transmission repair on older ones.
- 2016-2018 Q50/Q60 with the 3.0T: Early versions of the 3.0T had turbo wastegate actuator issues and some belt tensioner failures. Later model years (2020+) are generally better sorted.
- Any QX80 with heavy off-road use: The body-on-frame platform is tough, but the air suspension (if equipped) and the rear axle can show wear if the vehicle was used for towing near the limit. Check service records for differential and transfer case fluid changes.
How to Evaluate a Used Infiniti Before You Buy
If you’re shopping used, you need a systematic approach—not just a test drive and a hope. Here’s a practical inspection flow that applies to any Infiniti model.
What you’ll need: A phone with a flashlight, a clean rag, and about 30 minutes. If you’re looking at a specific model with known issues (like the QX60 CVT or the 3.0T belt tensioner), bring a printout of the relevant service bulletins or forum threads so you know exactly what to check.
Early checkpoint—the service record scan: Before you even look at the car, ask for the full service history. You’re looking for two things: regular oil changes at 5,000-7,500-mile intervals, and any transmission fluid service. If the owner can’t produce records, that’s a yellow flag, not a dealbreaker—but it means you should assume the worst and price accordingly.
Ordered inspection steps:
1. Start the engine cold. A cold start tells you more than a warm one. Listen for a rattling timing chain on startup (common on higher-mileage V6s), and watch the exhaust for blue smoke, which indicates oil burning. Let it idle for two minutes and check for rough idle or misfire codes via an OBD2 scanner if you have one.
2. Check the transmission behavior. On a test drive, accelerate gently from a stop, then do a full-throttle pass. The shift should be firm but not harsh. On CVT-equipped models (QX50, QX55), listen for a high-pitched whine under acceleration—that’s a sign of belt wear. On the 7-speed and 9-speed automatics, feel for a hard 2-3 shift when the transmission is cold; a clunk on that specific shift is a known complaint on some Infiniti units.
3. Inspect the serpentine belt and tensioner (3.0T models). With the engine off, press on the belt between pulleys. It should deflect no more than half an inch. Spin the tensioner pulley by hand—it should rotate smoothly with no grinding. A wobbly pulley or a belt with cracks on the ribbed side means replacement is due soon.
4. Check for fluid leaks underneath. Look at the front of the engine for oil residue around the timing cover, and check the transmission pan for dark red fluid. On QX80s, also check the rear axle seals for leaks—a common issue on high-mileage examples.
Likely causes of common problems: If the transmission shifts hard when cold, the most likely cause is old fluid, not mechanical failure—a fluid change often fixes it. If the 3.0T has a rough idle, suspect the wastegate actuators before anything else; they’re a known weak point on 2016-2018 builds. If the QX80’s air suspension sags overnight, the air springs are leaking—replacement runs $800-$1,200 per corner.
Stop and escalate when: You see any of these three things: (1) transmission fluid that’s dark brown or smells burnt—that’s internal wear, not a service issue; (2) engine oil that looks like a milkshake—that’s coolant contamination, meaning a head gasket or oil cooler failure; (3) any dash warning light that stays on after a test drive, especially the check engine light with a misfire code. Any of these means you walk away or negotiate a significant repair allowance, because the repair cost will likely exceed the price difference between this car and a cleaner example.
Success check: The car starts cleanly, shifts smoothly through all gears, shows no warning lights, and the service records confirm regular maintenance. That’s a solid buy—assuming the price reflects the model’s known quirks and you’ve budgeted for the first round of preventive maintenance (fluid changes, belt inspection, brake fluid flush) within your first 1,000 miles of ownership.
Expert Tips for Buying an Infiniti
Tip 1: Check the transmission service history before buying any used Infiniti with a CVT or 7-speed automatic.
Infiniti’s recommended service intervals call for fluid changes, but many owners skip them. A transmission that’s never had its fluid changed is a ticking clock. Ask for proof of service, not just verbal assurance. If there’s no record, factor a fluid change into your purchase cost immediately.
Tip 2: On the 3.0T engine, inspect the serpentine belt and tensioner before purchase.
This is a known weak point. Look for cracks on the belt and any wobble in the tensioner pulley. If the belt is glazed or frayed, plan to replace it within the first 1,000 miles of ownership. It’s a cheap fix ($100-200 in parts) that prevents a breakdown.
Tip 3: Verify the infotainment software version on 2019-2021 models.
The dual-screen infotainment system in the Q50 and QX50 had lag and freezing issues in early software versions. A dealer can update it, but only if the car is under warranty or you’re willing to pay. Check that the system responds quickly and doesn’t reboot randomly during a test drive.
FAQ
Which INFINITI model is the best?
The best Infiniti depends on your priorities. The QX60 (2022 and newer) is the most balanced for families—reliable V6, conventional 9-speed automatic, and a modern interior. The Q50 Red Sport 400 is the best for driving enthusiasts. The QX80 is the best for towing and maximum space.
Which INFINITI models to stay away from?
Avoid early QX60s (2014-2019) with the CVT transmission, as they have a documented history of transmission failures. Also be cautious with 2016-2018 Q50/Q60 models with the 3.0T engine, which had early turbo actuator and belt tensioner issues.
What are the different types of INFINITI models?
Infiniti currently sells the Q50 sedan, QX50 and QX55 compact crossovers, QX60 three-row midsize SUV, and QX80 full-size SUV. The Q60 coupe was discontinued after 2022. The QX70 was discontinued after 2017 but remains common on the used market.
What is INFINITI the high end version of?
Infiniti is the luxury division of Nissan, similar to how Lexus relates to Toyota and Acura relates to Honda. Many Infiniti models share platforms and components with Nissan vehicles—the QX80 shares its platform with the Nissan Armada, and the QX60 shares its platform with the Nissan Pathfinder.
Greedy Wheels is the founder and lead editor at Wheels Greed. With over 15 years of hands-on automotive experience — from rebuilding engines in a home garage to managing fleet maintenance for a regional logistics company — he brings real-world mechanical knowledge to every guide.
His work has been featured in automotive forums, owner communities, and dealership training materials. When he’s not researching the latest car owner questions, you’ll find him at a local track day, wrenching on his project car, or testing the newest OBD2 diagnostic tools.
At Wheels Greed, every article is reviewed against manufacturer service manuals, NHTSA bulletins, and verified owner reports. No AI-generated fluff. No guesswork. Just practical answers from someone who has turned the wrench.