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Infiniti M: Y50 and Y51 generations, engines, and what to check
Infiniti M — a luxury sedan for the mid-range and upper classes, produced by Nissan's luxury brand Infiniti from 2005 to 2013 (the first M30 coupe debuted in 1990). We look at the generations, engines, and what to check when buying a used car in Lithuania.
M in brief
Infiniti M — a four-door sedan with rear-wheel drive, a distinctly sporty ride, and a generous array of features. The modern M was produced in two generations: Y50 (2005–2010) and Y51 (2010–2013), which was later replaced by the Q70.
The car competed with the BMW 5 Series and Mercedes-Benz E-Class, but was rarer in Europe. Therefore, the supply of used cars in Lithuania is small, mostly imported from the USA.
Which generation to choose
The Y50 is the earlier, more basic generation with V6 and V8 petrol engines. It's considered reliable, but quite old now, so many cars have high mileage.
The Y51 (2010–2013) received a sharper look, a more modern interior, and more engine choices, including the diesel and hybrid variants sold in Europe. This generation is more appealing if you're after a more modern car.
Engines and transmissions
Y50 versions most often came with V6 (around 3.5-litre) and V8 (around 4.5-litre) petrol engines. The Y51 gained a around 3.7-litre V6 petrol engine (around 320–330 hp), a larger V8 (not in all markets), the hybrid M35h (around 360 hp), and the Europe-specific 3.0-litre V6 diesel M30d (around 240 hp).
Transmissions are mostly automatic (five- or seven-speed), usually driving the rear wheels, with some versions offering all-wheel drive. Manual transmissions are virtually non-existent.
What to check when buying an Infiniti M
First and foremost, check the service history and mileage accuracy, especially for imports from the USA. Ensure the automatic transmission operates smoothly: shifts should be seamless, without any jolts.
Inspect the suspension and brakes, as the car is heavy. For hybrids, inquire about the high-voltage battery condition, and for diesels, check the particulate filter and fuel system.
More features mean more electronics: test the multimedia system, cameras, seat adjustments, and other functions. Since the model is rare, find out in advance where you can source parts.
Trim levels
Trim names depend on the market and year, so we provide an overview of versions available in Europe.
M (Y50 pagrindinė)
2005–2010 model yearsPrevious generation trim with a V6 or V8 engine.
- Often includes leather and xenon headlights
- Often includes navigation
- Rear-wheel drive
GT
2010–2013 model yearsThe base Y51 trim with a good level of equipment.
- Often includes leather and navigation
- Often — parking camera
- Engine depends on the version
GT Premium
2010–2013 model yearsHigher trim with more comfort
- Often — heated seats
- Often — Bose sound system
- Additional safety systems
S ir S Premium
2010–2013 model yearsSportier versions
- Often — sport package
- Often — larger alloy wheels
- Often — firmer suspension settings
Trim comparison
| M (Y50) | GT | GT Premium | S Premium | |
|---|---|---|---|---|
| Who it's for | A more straightforward luxury sedan | For everyday comfort | For maximum comfort | For sportier driving |
| Wheels (usually) | 17–18 inch | 18 inch | 18 inch | 19 inch |
| Interior | Leather, basic trim | Leather, plusher trim | Leather, heated seats | Sport seats |
| Price in the used market (relatively) | € | €€ | €€ | €€€ |
Most buyers will opt for the GT or GT Premium with the reliable V6 engine, while the S Premium is worth considering only if you're after a sportier ride.
Pros
- Luxurious, generously equipped interior
- Sporty driving and rear-wheel drive
- Powerful, refined engines
- Often a more attractive price than German competitors
Cons
- Rare model, limited parts availability
- High fuel consumption with V6 and V8
- Some cars imported without official history
Frequently asked questions
Is the Infiniti M reliable?
Generally yes, if well-maintained. It's crucial to check the service history, automatic transmission, and electronics.
What's the difference between the Y50 and Y51?
The Y51 is newer, more modern, with an updated design, more features, and a wider range of engines, including diesel and hybrid options for Europe.
What replaced the Infiniti M?
In 2013, the M model was replaced by the Q70, which is essentially the same car with a new name.
Updated 2026-10-21 · Trim levels and equipment vary by market and model year — check the equipment of the specific car. · Translated automatically
