2006 Infiniti M45 Sedan Review | Edmunds.com

2006 Infiniti M45 Sedan

We didn't find any results. You can try changing your zip code, or check another model year.

We found matches for you!

Infiniti M45 Features and Specs

Features & Specs

  • Engine 4.5 L V 8-cylinder
  • Drivetrain Rear Wheel Drive
  • Transmission 5-speed Automatic
  • Horse Power 335 hp @ 6400 rpm
  • Fuel Economy 16/21 mpg
  • Bluetooth Yes
  • Navigation No
  • Heated Seats Yes

Review of the 2006 Infiniti M45

  • If a torquey V8, superior driving dynamics G35-meets-FX45 styling appeal to you, then the 2006 Infiniti M45 is your car.

  • Safety
  • Pros

    Explosive power from smooth V8, capable handling, plenty of luxury features, excellent transmission.

  • Cons

    Noisy ride, complicated center stack controls.

  • What's New for 2006

    The M45 is completely redesigned for 2006 and bears no relation to the 2003-2004 M.

What Others Are Saying

Customer Reviews

  Average Consumer Rating (25 total reviews)  |  Write a Review

06 m45 luxury muscle car

by on
Vehicle: 2006 Infiniti M45 4dr Sedan (4.5L 8cyl 5A)

06 M45 non-sport journeyman off lease 32k miles. So much fun to drive you just don’t want to get out. Powerful and smooth acceleration at all speeds. All controls are easy to operate. I’m 6’4 & fit very well in terms of head and leg room. The M45 was the right combination of power, ride quality and technology goodies for me. The Bose sound system is wonderful. The M45 sport was just too stiff a ride for me. The M35 does not have the same power, only 1 MPG difference anyway. I bought the Infiniti extended warranty (bumper to bumper) till 100k miles or 2014. Infinity also has the best car loaner program. You always get a loaner (g35) no matter how old or out of warranty your infiniti.


by on
Vehicle: 2006 Infiniti M45 4dr Sedan (4.5L 8cyl 5A)

Purchased the M45 after owning a BMW 525, then a 2000 740IL. The Tech package of the M is awesome. Love the 3D GPS, voice activated controls, rear backup camera, A/C control seats (could be better), and overall looks. But from the very first oil change, have noticed using oil; not leaking, not smoking, but I have added from 1 to 2 quarts between changes. Also, moonroof leaks in any car wash, have had to have the AC serviced each year. Heated and cooled seats do not compare to the BMW. Ride is noisy, low-profile tires look great, but makes bumpy ride. If battery dies, no way to open the trunk (for jumper cables).

Best performance luxury sedan

by on
Vehicle: 2006 Infiniti M45 4dr Sedan (4.5L 8cyl 5A)

This car is simply amazing. With the luxury and performance combined together, few can match. Infiniti gets it just right. It is packed with luxury options to make it a true luxury car, while the 335hp V8 with firm suspension makes the car a true performer. It is not a sports car for sure, which it should not be, as it is a luxury sedan. This car makes the trip enjoyable no matter drive it fast or slow.

Great choice in this segment

by on
Vehicle: 2006 Infiniti M45 4dr Sedan (4.5L 8cyl 5A)

Purchased used w/4,000 miles, all options except DVD screen and heated rear seats. Great performance and handling for such a large car. Tested Lexus GS 430 and BMW 530 but M45 seemed much roomier in the back and quicker as well. Love the soft leather and rosewood, even though Lexus still more refined inside. Exterior styling also a little bland compared to E500 and GS 430. Nice exhaust rumble that's not intrusive when cruising at highway speeds. Glad I don't have sports suspension, supple ride that's only occasionally harsh over very large irregularities (especially if accelerating hard). Rides a bit noisier than Lexus, but expected given sporty personality.

Love it

by on
Vehicle: 2006 Infiniti M45 4dr Sedan (4.5L 8cyl 5A)

I originally was going to buy the GS 350, but after driving it several times, I felt cramped and I couldn’t even sit in the back seat with out slouching over. Once I drove the M45, it has plenty of room and power (more than the GS430) and costs less. It's a very civilized hot rod! Love it!

The facts and nothing but...

by on
Vehicle: 2006 Infiniti M45 4dr Sedan (4.5L 8cyl 5A)

An exemplary combination of fit, finish, power, convenience, reliability, power, comfort and all other characteristics one would expect of a vehicle of this class and price.

Full 2006 Infiniti M45 Review

What's New for 2006

The M45 is completely redesigned for 2006 and bears no relation to the 2003-2004 M.


The original Infiniti M45 was designed for buyers who wanted something more than a G35, but something less than the flagship Q45. Though a good bargain, the old M45 just didn't have the style, features or interior room to appeal to luxury sedan buyers. It was a fast car, while its handling was firm but certainly not world-class.

After two years of sales, Infiniti pulled the plug and began work on an all-new M sedan. Well worth the wait, the new Infiniti car is a bona fide rear-drive performance sedan, still positioned between the flagship Q45 and the Infiniti G35 sport sedan. Looking much like a grown-up version of the G35, the Infiniti M45 sedan rides on an extended version of the G's rear-drive FM (front midship) platform. Unlike the previous Infiniti M45 sedan, the new M's interior offers dimensions and materials befitting a proper luxury ride. The standard interior is warm and inviting; the seats are firm and supportive; the standard amenities are plenty.

Its 340-hp, 4.5-liter, double-overhead-cam V8 is as good an engine as you'll find in any sedan. It provides plenty of low-end torque, freely revs to its 6,800-rpm redline and it's smooth enough to be in a car that costs twice as much. Power delivery, either out on the highway or off the line, is downright explosive. The responsive five-speed automatic transmission blips the throttle for you when you downshift and matches the engine revs flawlessly. The basic suspension setup is a double-wishbone front, multilink rear affair that, while tuned for compliance, isn't above taking on a stress-relieving two-lane blast into the foothills. The speed-sensitive steering is beautifully weighted, and never overboosted.

The Sport Package firms up the suspension without abandoning ride comfort, and adds Rear Active Steer which prompts the rear tires to emphasize turn-in when entering corners and enhance stability when exiting. Other Sport Package highlights include 19-inch cast-alloy wheels (standard are 18-inchers), climate-controlled front sport seats and aluminum interior trim. While the previous version never felt like a complete package, the new Infiniti M45 makes no excuses for its performance sedan intentions and feels like a hot rod next to the mild-mannered luxury sedans of the world. At the same time, a high level of style and luxury smooth the car's hard edges, and make the 2006 Infiniti M45 a must-drive in the midsize luxury sedan class.

Body Styles, Trim Levels, and Options

The Infiniti M45 sedan is offered in two trim levels, base and Sport. Each one is furnished with leather upholstery, a 10-way adjustable driver seat with memory, one-touch up-and-down power windows, dual-zone automatic climate control, an auto-dimming rearview mirror, heated outside mirrors and wood trim. The Sport includes rear active steering, sport suspension, upgraded wheels, adaptive HID headlamps, aluminum interior trim and climate controlled sport seats. Options include a DVD-based navigation system, voice recognition technology and laser-based intelligent cruise control (when in cruising mode, this system senses vehicles ahead and adjusts your speed to maintain a selected following distance). Among the other extras are climate-controlled seats, adaptive HID headlamps, a lane departure warning system and a 14-speaker Bose Studio Surround sound system with digital 5.1 channel decoding.

Powertrains and Performance

The Infiniti M45 features a 4.5-liter V8 that pumps out 335 horsepower and 340 lb-ft of torque. A five-speed automatic with automanual capability and downshift rev matching is standard. At the track, that drivetrain gets the sedan from zero to 60 mph in 5.7 seconds, and through the quarter-mile in 14.4 seconds at 99.6 mph.


The M45 wears a full set of vented disc brakes, supplemented by ABS and the usual luxury car fare -- Electronic Brakeforce Distribution and BrakeAssist. Infiniti's VDC stability control system is also standard. All Infiniti M45 models also feature front-seat side-impact airbags, front and rear side curtain airbags and active head restraints for the front seats. An available lane departure warning system alerts the driver of unintended lane drifting.

Interior Design and Special Features

The M45's interior is well appointed and features ultrasoft leather seating and Brazilian Rosewood trim (aluminum on the Sport model). Its firm seats are infinitely adjustable, universally comfortable and heavily bolstered. Overall, the interior of this Infiniti car is well built and attractive, but its decor can be a bit busy.

Driving Impressions

The V8 engine in the 2006 Infiniti M45 provides gobs of low-end torque and is smooth enough to be in a car that costs twice as much. Power delivery, either out on the highway or off the line, is downright explosive. Braking performance is impressive, and a firmly tuned suspension provides excellent balance in the corners. The tradeoff is steering that can feel a bit raw around town and a suspension that crashes over large road irregularities, especially in the firm Sport model.

Talk About The 2006 M45

Gas Mileage


  • 16
  • cty
  • 21
  • highway
Calculate Yearly Fuel Costs