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Infiniti FX: premium crossover, two generations and engines
Infiniti FX — a sporty premium-class crossover produced since 2003 and later renamed QX70. In this article, we review the first and second generations, engines, and what to check when looking for a used FX.
FX in brief
The Infiniti FX stands out with its long front end, low roofline, and sporty character. It was one of the first sporty crossovers to offer powerful V6 and V8 engines and a rear-wheel-drive-focused driving character.
The model is primarily praised for its driving dynamics and features, but you should consider higher running costs and a less spacious interior.
Generations — what sets them apart
The first generation (S50, 2003–2008) is known for its distinctive design and powerful engines, but it is now quite an old model. The second generation (S51, 2008–2013) received a more modern interior, new engines, and more safety features.
The 2013 model was renamed QX70. Many buyers find the second generation more interesting, as it also came with a diesel variant for the European market.
Engines and transmissions
The first generation featured a 3.5-litre V6 (FX35) and a 4.5-litre V8 (FX45). The second generation offered a 3.7-litre V6 (FX37), a 5.0-litre V8 (FX50), and a 3.0-litre V6 diesel (FX30d) for the European market.
Transmissions are automatic, with most versions offering five or seven speeds. Most cars come with all-wheel drive, which, when needed, transfers some power to the front wheels.
What to check when buying a used FX
Check the electronics, suspension, and all-wheel drive. For most cars, verifying the service history is crucial, as complex technology is expensive to fix.
Pay attention to the condition of the brake discs and tyres, as they are large and costly. In diesel versions, assess the particle filter and turbocharger, and in V8 versions, check the consumption and cooling system.
Trim levels
Names and equipment vary by market and year; we describe the most commonly encountered versions.
FX35
first generationFirst-generation version with a 3.5 l V6.
- 3.5 l V6
- Often — all-wheel drive
- Often — leather interior and plenty of equipment
FX45
first generationMore powerful version with a 4.5 l V8.
- 4.5 l V8
- Often — full equipment package
- High fuel consumption
FX30d
second generationDiesel version for the European market.
- 3.0-litre V6 diesel
- Automatic transmission
- Often — all-wheel drive
FX37
second generationSecond-gen petrol version.
- 3.7-litre V6, around 320hp
- Often — all-wheel drive
- Often — full safety and comfort package
FX50
second generationMost powerful version with 5.0-litre V8.
- 5.0-litre V8, around 390hp
- Often — sporty interior
- Highest fuel consumption
Trim comparison
| FX35 | FX30d | FX37 | FX50 | |
|---|---|---|---|---|
| Who it's for | For first-gen enthusiasts | For the more economical FX buyer | For those who love a powerful V8 | For the majority of buyers |
| Engine | 3.5 l V6 | 3.0-litre V6 diesel | 3.7 l V6 | 5.0 l V8 |
| Generation | First | Second | Second | Second |
| Price in the used market (relatively) | Budget-friendly | Mid-range | Mid-range | Premium |
For most buyers, the best choice is a second-gen FX37 or FX30d with a full history. V8 versions are intriguing for enthusiasts but costlier to maintain.
Pros
- Sporty handling and striking design
- Powerful V6 and V8 engines
- Generous equipment
- Comfortable and high-quality interior
Cons
- High fuel consumption
- Complex technology and expensive maintenance
- Cramped interior and boot space
Frequently asked questions
Are the FX and QX70 the same?
The second-gen FX was rebadged as the QX70, technically it's the same car with minor changes.
Which FX generation is better?
The second-gen is more modern and has more safety features, but the first-gen is cheaper. Most buyers would be better off choosing the second.
Is the FX economical?
No, especially the V8 versions. The most economical is the diesel FX30d.
Updated 2026-10-21 · Trim levels and equipment vary by market and model year — check the equipment of the specific car. · Translated automatically
