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Infiniti M45

Aside from an unrelated platform with the ‘M’ designation in the early 1990s, the Infiniti M45 represents the start of Infiniti’s higher end midsize luxury performance sedans. Debuting in 2003, the M45 remained in production for a few years before going through a redesign and being joined by the very similar M35, in 2006. This M series lineup continued through 2010. In 2011, the M45 underwent a redesign and upgrade and had its name changed to M56.

More on the Infiniti M45
About the Infiniti M45

As with many Infiniti cars, the numerical portion of the name indicates engine size. The M45 uses a 4.5-liter V-8 engine. The M series cars are above the I and G series cars Infiniti makes in terms of cost and quality and just below the maker’s flagship Q45.

The first generation of the M45 has a cramped interior and an unappealing design. In a car class that includes BMW, Mercedes-Benz, and Lexus, a vehicle hoping to sell has to have curb appeal and some serious luxury on the inside. Fortunately for the M45, Infiniti met the high in class standards for appearance, design, and comfort for later revisions. These changes gain the M45 acclaim and praise in the car community.

Infiniti M45 Features

Critics find the first generation of the M45 lacking in luxury and respectable performance. Materials on the interior fall short of expectations for this class. The interior does not offer the generous room and comfort that luxury buyers expect. Originally, the M45 was known as a solid attempt by a company to enter into new territory and take on well-established competition in a crowded class.

Models made from 2006 to 2010 serve as great examples of fine performance luxury midsize sedans. Viewed as great values, these cars gain respect for the comfort and performance they provide. These M45s also use quality materials and offer extensive features, especially for the price. These cars possess a surprising amount of technology and display the bold design that a buyer in this class will demand and be pleased with for the cost.

The few downsides of the heavily lauded second generation M45 amount to a few small complaints. Road noise is excessive for a car that should offer all aspects of luxury, including a quiet ride. The center stack controls practically require a college degree to master, and some question the logic of using extra gas for a V-8 when the M35 produces almost as much power with a more efficient V-6.

On the plus side, the model’s power, acceleration, tight handling, and an extensive list of features, all help to create the positive reputation the M45 enjoys today.

The 2012 M45 is actually the 2012 M56. For those seeking this model year’s incarnation of the Infiniti classic performance luxury sedan, take a look at what the M56 has to offer.

Infiniti M45 Evolution

Infiniti did not offer an M45 in 2005, making the 2003 and 2004 models the first generation, and the 2006 to 2010 models the second generation. All models from both generations of the M45 include a 4.5-liter engine that produces 325 horsepower and 336 lb-ft of torque. Also employed for both generations is a five-speed automatic transmission with a Drive-Sport mode that uses higher shift points and more aggressive kickdown than regular Drive. It also features a clutch-less manual mode.

The two original trims include base and Sport, although base is a misleading term given the amount of features it includes. The base model offers leather upholstery, driver memory functions, dual-zone automatic climate control, 18-inch alloy wheels, xenon headlights, keyless access with push-button startup, power-adjustable front seats, heated and cooled front seats, a moonroof, dual-zone automatic climate control, and a six-speaker, six-CD stereo. The Sport package adds 19-inch wheels, a sport-tuned suspension, active rear steering, and adaptive xenon headlights. Other options include navigation adaptive cruise control; a lane-departure warning system; an eight-speaker, two-channel or 14-speaker, 5.1-channel surround sound stereo; a backseat DVD player; a navigation system; and a backup camera, plus heated and power-reclining rear seats.

Minor variations occur in the packages and options throughout the second generation. 2008 brought slight cosmetic changes to the M45. Infiniti also added a new trim level called the M45x, which offers all-wheel drive on the typical rear-wheel drive sedan. The updated navigation system includes a hard drive and digital music capabilities. This design remained in use until the change over to the M56 model.

Select an Infiniti M45 Year

2010 Infiniti M45
ESTIMATED RESALE: $18,611

MPG
14-21
Seats
5

2009 Infiniti M45

Luxury, Sedan


The 2009 Infiniti M45 contains a 4.

ESTIMATED RESALE: $17,810

MPG
14-21
Seats
5

2008 Infiniti M45

Luxury, Sedan


The 2008 Infiniti M45 is a well-equipped luxury sport sedan in the midsize range.

ESTIMATED RESALE: $14,353

MPG
14-21
Seats
5

2007 Infiniti M45

Luxury, Sedan


The 2007 Infiniti M45 is a luxury sedan that offers the performance and handling that drivers desire.

ESTIMATED RESALE: $12,580

MPG
N/A
Seats
5

2006 Infiniti M45

Luxury, Sedan


The original M45 sedan was a compromise between the expensive Q45 flagship offered by Infiniti, and the entry-level sport sedan, the G35.

ESTIMATED RESALE: $11,866

MPG
N/A
Seats
5

2004 Infiniti M45

Luxury, Sedan


It’s no surprise to anyone that the most popular class for the luxury car is the midsize class.

ESTIMATED RESALE: $6,170

MPG
17-23
Seats
5

2003 Infiniti M45
ESTIMATED RESALE: $5,710

MPG
17-23
Seats
5

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