Overview & Reviews

The M45 performance sport sedan comes standard with class-leading V8 performance and a long list of world-class amenities.

• Brawny V8 engine, capable handling, plenty of luxury features, reasonable price.

• Limited rear-seat legroom and trunk space, fussy control layout.

User Reviews:

Showing 1 through 10 of 105.00

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  Still drives very well - 2003 Infiniti M45
  By qualityfirst1 - September 5 - 6:00 pm

  This car had lots of positives, but the few negatives does sour our ownership experience. Our M45 has a very unique look, which Ive come to like. The interior is still very nice. Our car still drives very well - it doesnt feel like 108K mi. The power is very impressive. The aluminum suspension components cut unsprung weight. A lot of things have broken, which is upsetting. Infiniti service writers are nice, but they will not fight for the customer. Our air bag light has been on since a hair over 50K mi. The warranty is good up to 7yr/70K, but they wouldnt fix it. The oil issue stinks. Due to the bad service, I wont buy again.

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  Refinement Needed - 2003 Infiniti M45
  By Roadglide99 - December 2 - 2:00 am

  Well the ergonomics could be better. The shifter, cup holder and armrest need to be reconfigured. So does the CD player (single in-dash is preferred). I have 3,500 miles on the car and I had a problem with the Trans. getting stuck in 2nd. gear @1,200 miles. Tried everything, finally shut the engine off and restarted, appears ok. The dealer tested it repeatitally with nothing found (the trans. is lazy while in automatic mode, when stepping on the gas to down-shift and pass). Oh the gas milage does stink, and I dont drive it wildly, ok very seldom... getting about 18mpg.

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  M45: Great Machine - 2003 Infiniti M45
  By LoveCars - March 27 - 10:00 am

  This is a great automobile! The body style is unique and sharp. Although similar lines to the new Cadillac, I find the M45 lines much more refined compared to the "boxy" look of the Cadillac. The interior is very handsome looking. The automatic retracting seat and lifting steering wheel for ease of entrance and exit is a nice touch. The tiptronic 5 speed transmission lets me enjoy additional acceleration and control when I want to have extra "fun". The audio controls on the steering wheel make audio operation safe and easy while in motion. The voice controlled audio and climate control system also make for ease and safety of control while driving.

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  Always liked the style and power. - 2003 Infiniti M45
  By realdeal305 - March 6 - 5:14 pm

  I just purchased a 2003 M45 with 70,000 miles on it. Ive always liked the style and the power is great. Its a great used car bargain Im just glad I never bought it new. The quality is below luxury in my book. I also have a Lexus the quality of the material and finish is top notch. The Infiniti not so much trunk struts dont work, center arm rest is cheap and feels loose, sunroof liner coming apart, fuel guage not reading correctly (recalled ), engine doesnt start up on first try sometimes, and airbag light is on. Alot of issues for a car with 70k, but Ive always wanted one and I dont regret buying it for $7500. Especially since its not a daily driver. I have a Gs300 and Yaris for that.

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  The M45 - 2003 Infiniti M45
  By elagee - July 21 - 2:00 am

  This car is a smaller version of the Q45 but it certainly doesnt ride like it. I can feel every bump in the road. But, if you like power and speed and want to blow the doors off of the car next to you, this is the one. The ride is firm, there is no hesitation in acceleration, curves are not a problem and as the driver you have complete control of the car---no matter how fast you are going. Appointments are nice but not spectacular. Although I have only owned the M45 for a short time I am enjoying driving it.

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  Infinity M 45 - 2003 Infiniti M45
  By valo - July 21 - 2:00 am

  THe turning radius on this supposed sport vechicle is pitiful.It takes two attempts to make a u turn.You cannot make any adjustment to temp or radio with doing two things. Nothing is easy. The driver seat is so uncomfortable. I had 3 Q 45s before this - I made a terrible error in buying this car.

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  Jeckyll and Hyde - 2003 Infiniti M45
  By qualityfirst1 - May 14 - 6:16 am

  I still believe this car is a Jeckyll and Hyde. Were still enjoying the power, but the transmission isnt very responsive and the manual mode is worthless. The seats are comfortable and have nice amenities, but the drivers seat squeaks now. We still love all the gadgets, but they are difficult to use. Weve encountered more issues, but we do have 108K miles now. The exhaust manifold was changed under warranty. Now its cracked again - poorly engineered. We still burn a quart every 1,000 miles (108 quarts so far!) Tire wear is phenomenal. The originals ran 28K miles. The second set were Essenzia and were just changed. The new Hankook Ventas dont feel very good on the car.

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  Powerful Sport Sedan - 2003 Infiniti M45
  By qualityfirst1 - November 30 - 9:13 pm

  This car intrigues you. A true Jekyll and Hyde. Lots of power - Manual mode on transmission is worthless. Comfortable seats - Hard to reach seat controls. Nice wood and leather interior - console and glove box are loose. Lots of goodies - Too many steps involved to enjoy them. Feels great up to 120 mph - feels unsafe at 125 mph. Big car - Interior feels narrow. I like the handling and performance of my car, but it does not have give you feedback like my BMW 540i. This car is a sleeper. You can pull away from nearly every car on the road. Stereo system is very nice. Ours is black with tinted windows and chrome wheels - I think the best color for this car. Engine burns lots of oil!

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  Longevity, I wonder? - 2003 Infiniti M45
  By Roadglide99 Revised - December 21 - 10:00 am

  I have 30k miles and see puff of blue smoke on cold start up along with a broken driver seat cooling switch. Dealer had car for two wks. Told me it needed engine de-carbonization and a broken wiring harness in the seat. To NO satisfaction the blue smoke still appears on EVERY cold start. They tell me its the advanced oiling system providing more oil in the valvetrain area and just burnoff. I say BULLSHIT! Called Infiniti direct, they said whatever the dealer says is what they go by. I cant speak to a regional rep., nothing. My only course of action see another dealer and get a second opinion. Gee, thanks for the help Mr. Manufacturer!

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  Infiniti M45 - 2003 Infiniti M45
  By deraye - November 19 - 2:00 am

  I have had the car for a little over a year doing predominantly highway miles and have enjoyed the power and the ride. However the car is a little large to "throw" around corners and that detracts from some of the pleasure. I have driven through three snow storms, and the rear wheel drive handles well on ice and snow. Dont care for the "manual" which essentially is an automatic that you "walk" through the gears.