INFINITI M45 vs INFINITI M56 Compare price, expert/user reviews, mpg, engines, safety, cargo capacity and other specs at a glance.

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User Ranking Drivers and owners ranked these cars in 9 categories.

Expert Reviews Reviews from CarGurus experts.

2010 INFINITI M45
RWD
Michael Perkins Preview:

The 2010 M45 takes Infiniti’s M35 sports sedan and adds some numbers, namely 23 hp in the form of a V8 upgrade over the M35’s V6. Unfortunately, that upgrade also comes with an extra 1...

2013 INFINITI M56
RWD
Patricia Mayo Preview:

Moving into 2013, Infiniti's highest tier of its flagship midsize M sedan benefits from the same updates as its small-block brothers while gaining some new inclusions to option packs t...

Specs

2010 INFINITI M45
RWD
2013 INFINITI M56
RWD
Powertrain 5-Speed Automatic 7-Speed Automatic
Drivetrain
RWD
RWD
Fuel Economy, City
16 MPG
16 MPG
Fuel Economy, Highway
21 MPG
24 MPG
Fuel Tank Volume 20 gal 20 gal
Engine
Fuel Type
Gasoline
Gasoline
Power
325 hp @ 6,400 RPM
420 hp @ 6,000 RPM
Torque
336 lb-ft @ 4,000 RPM
417 lb-ft @ 4,400 RPM
Cylinders
8 cylinders
8 cylinders
Compression Ratio
10.5:1
11.5:1
Displacement
4,500 cc
5,600 cc
Bore x Stroke
3.66 in x 3.26 in
3.86 in x 3.62 in
Safety
ABS Brakes Standard Standard
Driver Airbag Standard Standard
Passenger Airbag Standard Standard
Front Side Airbags Standard Standard
Curtain Airbags Standard Standard
NHTSA Crash Test Results
Overall -- 4 stars
Front Crash Overall -- 4 stars
Front Crash Driver -- 5 stars
Front Crash Passenger -- 4 stars
Side Crash Overall -- 5 stars
Side Barrier Driver -- 5 stars
Side Barrier Passenger -- 5 stars
Side Pole Driver -- 5 stars
Rollover -- 5 stars
Comfort and Convenience
Sunroof/Moonroof Standard Standard
Leather Seats Standard --
Air Conditioning Standard Standard
CD Player Standard Standard
CD Changer Standard --
Radio Standard Standard
Power Windows Standard Standard
Power Door Locks Standard Standard
Driver Power Seats Standard Standard
Passenger Power Seats Standard Standard
Interior
Maximum Seating 5 seats 5 seats
Front Legroom 44.2 in 44 in
Back Legroom 37.3 in 36.2 in
Payload and Towing
Cargo Volume 14.9 cu ft 14.9 cu ft
Maximum Payload 1,066 lbs 1,111 lbs
Exterior
Length 194.1 in 194.7 in
Width 71.1 in 72.6 in
Height 59.4 in 59.1 in
Wheelbase 114.2 in 114.2 in

Available Options

2010 INFINITI M45
RWD
2013 INFINITI M56
RWD

Exterior Colors

  • Black Obsidian
  • Liquid Platinum
  • Malbec Black
  • Moonlight White
  • Platinum Graphite
  • Storm Front Grey

Option Packages

  • [H01] Technology PKG
  • [K01] Deluxe Touring PKG
  • [R01] Sport PKG
  • [R93] Aerodynamic Kit
  • [W01] Performance Tire & Wheel PKG

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