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starting MSRP

Key specs

Base trim shown


The good:

  • Performance
  • Ride comfort
  • Interior space
  • Handling

The bad:

  • Throttle response
  • Uninspired styling
  • Fuel economy
  • Price
  • Slippery-surface traction

2 trims

Starting msrp listed lowest to highest price

Wondering which trim is right for you?

Our 2004 INFINITI M45 trim comparison will help you decide.

Notable features

  • 340-hp, 4.5-liter V-8
  • Five-speed automatic
  • Full-size dimensions
  • Premium amenities
  • RWD layout

2004 INFINITI M45 review: Our expert's take

Vehicle Overview
Introduced for the 2003 model year, the M45 full-size sedan from Nissan’s luxury division occupies a spot in both size and price just below Infiniti’s flagship Q45. Borrowed from the Q45 sedan, the M45’s 4.5-liter V-8 engine produces 340 horsepower. A five-speed-automatic transmission incorporates a manual-shift mode.

Billed by the automaker as a “luxury performance sedan,” the rear-wheel-drive M45 has a four-wheel-independent suspension. Five passengers can enjoy Sojourner leather seating surfaces, and the front occupants get sport-contoured bucket seats. Options include a DVD-based navigation system and a voice recognition system.

A full-size spare tire and tire-pressure monitor become standard for 2004, and the six-CD changer moves from the glove box to an in-dash position. Standard heated mirrors have a selectable reverse tilt-down feature.

Even though the M45 doesn’t look dramatically different from other models in its class, Infiniti focused on its sculpted wedge shape. Mark McNabb, general manager of the Infiniti division, referred to the sedan’s “strong, integrated appearance, as if carved from one piece of stone, with strong, ‘stealthy’ lines.” The front end is low and wide and features what Infiniti calls an aggressive grille. It is characterized by its wide, black, chrome horizontal bars that flow into the headlights.

Chrome door handles and body-colored side moldings and outside mirrors are installed. Clear-reflector taillights match the car’s xenon high-intensity-discharge headlights.

Riding a 110.2-inch wheelbase, the M45 measures 197.2 inches long overall, 69.7 inches wide and 57.6 inches tall. The sedan is equipped with power-vented disc brakes and speed-sensitive rack-and-pinion steering. Aluminum wheels hold P235/45R18 all-season Michelin tires, and performance tires will be available as a no-cost option.

Sojourner leather seating surfaces are provided for five occupants, and sport-contoured bucket seats are available up front. The driver gets an eight-way power adjustment, while the front passenger seat is equipped with a four-way setup. Heated and cooled front seats are optional. Bird’s-eye maple wood interior trim comes in a smoke graphite color, and the gauges are illuminated in orange.

A 225-watt Bose premium audio system uses cassettes and also has a six-CD changer. Intelligent Cruise Control uses lasers to sense vehicles ahead and then adjusts vehicle speed to maintain a selected distance. The trunk holds 13.4 cubic feet of cargo. Like other Infiniti models, the M45 is fitted with a telematics system.

Under the Hood
Like the Q45, the M45 is powered by a 4.5-liter dual-overhead-cam V-8 engine that generates 340 hp and 333 pounds-feet of torque. An electronically controlled five-speed-automatic transmission incorporates a manual-shift mode. Dual exhaust outlets are standard.

Dual-stage front airbags, front-seat side-impact airbags, and side curtain-type airbags for the front and rear passengers are standard. Antilock brakes include brake assist and electronic brake-force distribution. A standard Vehicle Dynamic Control system improves stability. The front seats have active head restraints.

Driving Impressions
A smooth, luxurious ride is the No. 1 trait in the M45, which looks and feels awfully large. But its handling is reasonably secure and tautly controlled, so you get a hint of sporty behavior along with plush road-going softness. The V-8 provides plenty of power, but responsiveness falls short of some sedans in this league. Interior space is bountiful.


Reported by Jim Flammang  for cars.com;
Posted on 9/26/03

Consumer reviews

Rating breakdown (out of 5):
  • Comfort 4.6
  • Interior design 4.7
  • Performance 4.9
  • Value for the money 4.9
  • Exterior styling 5.0
  • Reliability 4.9

Most recent consumer reviews


One of the most reliable luxury performance cars.

I love the luxurious ride, I love the V8. I love the plush, practical interior. The big screen is really nice. only the leather is wearing too fast.


Sporty Head Turner

The only thing that I dislike about this car is the gas mileage but what else can you expect from AV8 sports Sedan that was Built-in 2004?


Finally got my 2004 M45 - sooo happy

I absolutely love this car. I am 53 yrs old and I looked for over 2 years. Finally found one w/59,500 miles, locally owned, 2-owner and got it. It's awesome - drives so smoothly, only one in my neighborhood (friends have BMW, Mercedes, Audi etc). I love the exterior design, my v8 sleeper, very powerful and very fast. I gave it 4 stars on performance because it is slightly slow to respond compared to today's cars but once it kicks in it pulls hard and rolls. It has all the features of today's cars - heated/cooled seats, memory seats, one-touch sunroof and window up and down, leather is very comfortable. If you have a chance get one or drive one and then you will get it.

See all 7 consumer reviews


New car and Certified Pre-Owned programs by INFINITI
Certified Pre-Owned program benefits
Maximum age/mileage
Months from In-Service Date (ISD): Less than or equal to 60 months from ISD | Vehicle Mileage: Less than or equal to 15,000 Miles | Greater than 15,000 Miles but less than or equal to 60K miles
Basic warranty terms
6 years/75K miles from original ISD | 6 years/unlimited miles from original ISD
72 months/70,000 miles
Dealer certification required
167-point inspection
Roadside assistance
View all cpo program details

Have questions about warranties or CPO programs?

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