2011 Infiniti M56 Overview, Reviews, Ratings & Specs
The 2011 Infiniti M56 is a luxury sedan that replaced the M45 in Infiniti's lineup. Slotting between the G sedan and the larger Q45 (discontinued), it competed in the mid-size luxury segment. Available primarily as a sedan, the 2011 model year marked the debut of the redesigned M series. Key trims typically included the base M56 and the M56x all-wheel-drive variant. New pricing for the 2011 M56 ranged from approximately $57,000 to $62,000. It stood out for its powerful V8 engine, sophisticated styling, and a strong emphasis on technology and comfort, making it a compelling choice for those seeking performance and luxury.
The Good
The 2011 Infiniti M56 excels with its potent V8 performance, offering exhilarating acceleration that appeals to enthusiasts. Its refined interior provides exceptional comfort for long journeys, while the sleek, modern design garners appreciative glances. Reliability is generally strong, and for a luxury sedan, it offers considerable value, balancing premium features with a satisfying ownership experience.
The Bad
Potential owners of the 2011 Infiniti M56 should be aware of its relatively thirsty V8 engine, which impacts fuel economy. Some reported issues include infotainment system glitches and potential wear on suspension components over time. The luxury price point means repair costs can be higher than average.
2011 Infiniti M56: Quick Overview
- Engine Options: The 2011 Infiniti M56 comes exclusively with a 5.6-liter V8 engine.
- Horsepower: This V8 engine produces a robust 420 horsepower.
- Torque: It generates 417 lb-ft of torque.
- Transmission: A 7-speed automatic transmission is standard.
- Drivetrain: Available in rear-wheel drive (RWD) or all-wheel drive (AWD) (M56x trim).
- Fuel Economy (EPA Estimated): RWD models are rated at approximately 16 mpg city / 23 mpg highway. AWD models are slightly less efficient, around 16 mpg city / 22 mpg highway.
- 0-60 mph Times: Performance figures are impressive, with 0-60 mph times generally around 4.7 to 5.0 seconds, depending on RWD/AWD and testing conditions.
- Towing Capacity: The 2011 Infiniti M56 is not typically equipped or advertised for towing. Its focus is on luxury and performance driving rather than utility.
- Trim-Level Features (Base M56): Standard features include leather upholstery, heated and ventilated front seats, power-adjustable front seats, dual-zone automatic climate control, a rearview camera, Bluetooth connectivity, keyless entry and ignition, a Bose premium audio system, and 18-inch alloy wheels.
- Trim-Level Features (M56x - AWD): Includes all the features of the M56 plus all-wheel drive.
- Optional Packages: Buyers could opt for various packages that added features like a navigation system, adaptive cruise control, blind-spot monitoring, lane departure warning, a panoramic sunroof, upgraded audio systems (e.g., Infiniti Studio on Wheels), and premium interior materials.
2011 Infiniti M56 Specifications
Vehicle Information
| Year | 2011 |
| Make | Infiniti |
| Model | M56 |
| Trim | - |
| Style | 4-Door Sedan All-Wheel Drive |
| Type | Sedan |
| Category | Large Car |
Manufacturing Details
| Made In | Japan |
| Manufacturing City | TOCHIGI |
Dimensions
| Doors | 4-Door |
| Curb Weight | 1915.97 kg |
| Gross Vehicle Weight Rating | - |
| Overall Height | 151.38 cm |
| Overall Length | 494.54 cm |
| Overall Width | 180.59 cm |
| Wheelbase Length | 290.07 cm |
| Standard Seating | 5 |
Engine & Performance
| Engine | 5.6-L V-8 |
| Engine Size | 5.6L |
| Engine Cylinders | 8 |
| Transmission | Automatic |
| Transmission Type | Automatic |
| Transmission Speeds | 7-Speed |
| Drivetrain | All-Wheel Drive |
Additional Features
| Anti-Brake System | 4-Wheel ABS |
| Steering Type | Rack & Pinion |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | $60,950 USD |
| Invoice Price | $56,241 USD |
| Delivery Charges | $875 USD |
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What Problems Does the 2011 Infiniti M56 Have?
The 2011 Infiniti M56, being part of the redesigned M-series for that year, generally exhibits good long-term reliability, benefiting from Infiniti's reputation for robust engineering. However, like any vehicle, it has some commonly reported issues that owners and potential buyers should be aware of. One area that sometimes draws attention is the infotainment system. Glitches such as screen freezing, navigation system unresponsiveness, or Bluetooth connectivity issues have been reported by some owners. While not universal, these can be frustrating. Another concern, though less frequent, involves the SRS (Supplemental Restraint System) warning light. This can indicate a fault in the airbag system and requires prompt diagnosis. Some owners have also noted premature wear on suspension components, such as bushings or struts, particularly on vehicles with higher mileage or those subjected to rougher road conditions. This can manifest as increased noise or a less composed ride. Regarding recalls, the 2011 Infiniti M56 has had a few. Some of the more notable recalls have involved potential issues with the fuel delivery system, specifically the fuel pump, and certain braking system components. It is crucial for prospective buyers to check the vehicle's VIN against the National Highway Traffic Safety Administration (NHTSA) database to ensure all recall work has been completed. Overall, the M56 is considered a reliable luxury sedan, but diligent maintenance and awareness of these potential issues are key for long-term satisfaction. The powertrain, especially the V8 engine and 7-speed transmission, is generally robust, provided regular fluid changes and proper servicing are performed.
How long will the 2011 Infiniti M56 last?
The 2011 Infiniti M56, with its robust V8 engine and solid build quality, is capable of achieving well over 200,000 miles with proper and consistent maintenance. Owners who adhere to the recommended service schedule, including regular oil changes, fluid flushes, and timely replacement of wear items, can expect many years of reliable service. Long-term durability is generally high for the powertrain and core mechanical components. However, as with many luxury vehicles of this era, electronic components, particularly within the infotainment system, can become points of failure over time. Suspension components may also require attention around the 100,000-mile mark. Despite these potential areas, the M56 is built to last and offers good long-term value if well-cared for.
What Technology & Safety Features are Included?
The 2011 Infiniti M56 was well-equipped for its time, offering a blend of standard and optional technology and safety features aimed at the luxury segment. Standard tech included a 7-inch color display, a rearview camera, Bluetooth hands-free phone connectivity, and an 8-speaker Bose audio system with an in-dash CD/MP3 player and an auxiliary audio input.
Optional technology and entertainment features were extensive and often bundled into packages. These included a sophisticated hard-drive-based navigation system with real-time traffic information, voice recognition, and a 7-inch display. An upgraded 16-speaker Bose surround-sound audio system was also available, along with Infiniti's "Studio on Wheels" premium audio. A dual rear-seat entertainment system with screens could be optioned.
Driver-assistance features were a strong point for the M56, particularly in its optional configurations. Available systems included Intelligent Cruise Control (ICC) that could maintain a set distance from the vehicle ahead, Forward Collision Warning (FCW), and Forestalled Collision Mitigation (FCM). Lane Departure Warning (LDW) and Lane Departure Prevention (LDP) were also offered, subtly guiding the vehicle back into its lane. Blind Spot Intervention (BSI) and Blind Spot Warning (BSW) systems helped alert the driver to vehicles in blind spots. Other available aids included front and rear parking sensors and a 360-degree around-view monitor.
In terms of safety, the 2011 Infiniti M56 came standard with a comprehensive suite of airbags (front, side, and curtain), anti-lock brakes (ABS), stability control, and traction control. While specific crash test ratings can vary slightly by testing agency and year, luxury sedans of this caliber generally perform well. The M56 was designed to meet and exceed safety standards of its time, offering a protective environment for occupants. For example, the Insurance Institute for Highway Safety (IIHS) typically awarded high marks to vehicles in this class for front, side, and rear impact protection.
Optional technology and entertainment features were extensive and often bundled into packages. These included a sophisticated hard-drive-based navigation system with real-time traffic information, voice recognition, and a 7-inch display. An upgraded 16-speaker Bose surround-sound audio system was also available, along with Infiniti's "Studio on Wheels" premium audio. A dual rear-seat entertainment system with screens could be optioned.
Driver-assistance features were a strong point for the M56, particularly in its optional configurations. Available systems included Intelligent Cruise Control (ICC) that could maintain a set distance from the vehicle ahead, Forward Collision Warning (FCW), and Forestalled Collision Mitigation (FCM). Lane Departure Warning (LDW) and Lane Departure Prevention (LDP) were also offered, subtly guiding the vehicle back into its lane. Blind Spot Intervention (BSI) and Blind Spot Warning (BSW) systems helped alert the driver to vehicles in blind spots. Other available aids included front and rear parking sensors and a 360-degree around-view monitor.
In terms of safety, the 2011 Infiniti M56 came standard with a comprehensive suite of airbags (front, side, and curtain), anti-lock brakes (ABS), stability control, and traction control. While specific crash test ratings can vary slightly by testing agency and year, luxury sedans of this caliber generally perform well. The M56 was designed to meet and exceed safety standards of its time, offering a protective environment for occupants. For example, the Insurance Institute for Highway Safety (IIHS) typically awarded high marks to vehicles in this class for front, side, and rear impact protection.
What Colors Options are Available?
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2011 Infiniti M56 Prices and Market Value
When new, the 2011 Infiniti M56 carried a Manufacturer's Suggested Retail Price (MSRP) that started in the high $50,000s, with fully optioned models easily exceeding $60,000. As a luxury vehicle, it experienced significant depreciation in its initial years, a common trait for premium sedans. Currently, on the used market (as of late 2023/early 2024), prices for a 2011 Infiniti M56 typically range from $8,000 to $15,000, heavily dependent on mileage, condition, trim level (M56 vs. M56x), and the presence of desirable option packages. Factors affecting resale value include the thoroughness of maintenance records, the overall cosmetic and mechanical condition, and the number of previous owners. Vehicles with lower mileage and a clean history command higher prices. Despite the initial depreciation, the M56 has held its value reasonably well for its age, reflecting its inherent quality and luxury appeal.
2011 Infiniti M56 Cost of Ownership
Owning a 2011 Infiniti M56 can be more costly than a mainstream sedan. Insurance premiums will likely be higher due to its luxury status and powerful V8 engine. Fuel costs are considerable, with the V8 averaging around 18-19 MPG combined, necessitating frequent fill-ups at premium prices. Maintenance costs are also elevated; expect to pay more for routine services at a dealership or specialized shop. Repairs, especially for electronic systems or specialized components, can be expensive. Therefore, the M56 is not an economical vehicle to own. It falls into the category of a luxury vehicle where running costs are a significant consideration.
2011 Infiniti M56 Fuel Efficiency
Fuel Type
Other
Fuel Capacity
47.98 liters
City Mileage
6.25 km/l
Highway Mileage
4.34 km/l
2011 Infiniti M56 Safety Rating
NHTSA
IIHS
2011 Infiniti M56 Warranty
Basic
Original warranty
48 months / 60,000 miles
Estimated remaining
Expired
Powertrain
Original warranty
72 months / 70,000 miles
Estimated remaining
Expired
Rust
Original warranty
84 months / unlimited miles
Estimated remaining
Expired
2011 Infiniti M56 Insurance
Insurance for a 2011 Infiniti M56 is moderately priced, reflecting its status as a Sedan with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 2011 Infiniti M56 Compare to Other Sedan?
The 2011 Infiniti M56 competed in the highly contested mid-size luxury sedan segment against formidable rivals such as the BMW 5 Series (e.g., 550i), Mercedes-Benz E-Class (e.g., E550), Lexus GS (e.g., GS 460), and Audi A6 (e.g., A6 4.2 FSI).
Performance: The M56's 420-horsepower V8 engine was a strong suit, often outperforming rivals in raw acceleration, particularly against their V6 counterparts. While the BMW 550i and Mercedes E550 offered comparable or even more powerful V8s, they often came at a higher price. The Lexus GS 460 offered a smooth V8 but was generally less potent and sportier.
Features: Infiniti traditionally packed its vehicles with technology and luxury amenities, and the 2011 M56 was no exception. It offered advanced driver-assistance systems and a well-appointed interior that rivaled or surpassed many competitors. However, some rivals, like BMW and Mercedes-Benz, might have offered a slightly more sophisticated or customizable interior experience and a wider array of niche luxury options.
Reliability: Infiniti generally holds a good reputation for reliability, often surpassing European rivals in long-term dependability scores from organizations like Consumer Reports. While all luxury cars can have costly repairs, Infiniti has historically been more reliable than BMW and Mercedes-Benz in certain years. Lexus, known for its bulletproof reliability, was often the benchmark in this regard, and the GS was a very dependable option.
Price: The 2011 M56 offered excellent value for its performance and luxury features, often being priced more competitively than its German counterparts when new. On the used market, this trend often continues, making it an attractive option for those seeking V8 power and premium amenities without the premium price tag of a comparable BMW or Mercedes.
Alternatives: For those prioritizing outright luxury and brand prestige, a used 2011 BMW 550i or Mercedes-Benz E550 could be considered, though expect higher maintenance and repair costs. The Lexus GS 460 is a strong alternative if ultimate reliability and a more serene ride are paramount, though performance is less aggressive. If seeking strong performance with a more sporting edge and potentially better handling, a used BMW 535i (with its turbocharged inline-six) could be a more fuel-efficient, albeit less powerful, option. The Audi A6 3.0T, with its supercharged V6, also offers a good blend of performance and luxury. Ultimately, the M56 strikes a compelling balance of power, features, and value within its segment.
Performance: The M56's 420-horsepower V8 engine was a strong suit, often outperforming rivals in raw acceleration, particularly against their V6 counterparts. While the BMW 550i and Mercedes E550 offered comparable or even more powerful V8s, they often came at a higher price. The Lexus GS 460 offered a smooth V8 but was generally less potent and sportier.
Features: Infiniti traditionally packed its vehicles with technology and luxury amenities, and the 2011 M56 was no exception. It offered advanced driver-assistance systems and a well-appointed interior that rivaled or surpassed many competitors. However, some rivals, like BMW and Mercedes-Benz, might have offered a slightly more sophisticated or customizable interior experience and a wider array of niche luxury options.
Reliability: Infiniti generally holds a good reputation for reliability, often surpassing European rivals in long-term dependability scores from organizations like Consumer Reports. While all luxury cars can have costly repairs, Infiniti has historically been more reliable than BMW and Mercedes-Benz in certain years. Lexus, known for its bulletproof reliability, was often the benchmark in this regard, and the GS was a very dependable option.
Price: The 2011 M56 offered excellent value for its performance and luxury features, often being priced more competitively than its German counterparts when new. On the used market, this trend often continues, making it an attractive option for those seeking V8 power and premium amenities without the premium price tag of a comparable BMW or Mercedes.
Alternatives: For those prioritizing outright luxury and brand prestige, a used 2011 BMW 550i or Mercedes-Benz E550 could be considered, though expect higher maintenance and repair costs. The Lexus GS 460 is a strong alternative if ultimate reliability and a more serene ride are paramount, though performance is less aggressive. If seeking strong performance with a more sporting edge and potentially better handling, a used BMW 535i (with its turbocharged inline-six) could be a more fuel-efficient, albeit less powerful, option. The Audi A6 3.0T, with its supercharged V6, also offers a good blend of performance and luxury. Ultimately, the M56 strikes a compelling balance of power, features, and value within its segment.
Final Verdict: Is the 2011 Infiniti M56 a Good Sedan?
The 2011 Infiniti M56 is an excellent choice for buyers seeking a powerful, luxurious, and technologically advanced sedan at a more accessible price point on the used market. It's ideal for those who prioritize strong V8 performance and a comfortable, refined interior without the prohibitive cost of a new luxury car. It's worth buying if found in good condition with a documented maintenance history. Opting for the M56x all-wheel-drive model offers added security in inclement weather. While not as fuel-efficient as its V6 counterparts or competitors, its overall value proposition, especially when compared to similarly equipped German rivals, makes it a compelling used luxury car. Avoid if long-term, low-cost ownership is the primary goal, but if you're looking for a rewarding driving experience with plenty of comfort and power for the money, the M56 is a solid contender.
Eugene S
Eugene is an automotive enthusiast with over 15 years of experience in the used car market. As a writer at VINCheck.info, he brings deep industry insight and a passion for cars, helping readers make smart, informed decisions. Eugene has written hundreds of used car reviews and is known for breaking down complex automotive topics into clear, actionable advice. Over the years, he has driven and worked on a wide range of vehicles—starting with tuning street cars in his early days and eventually focusing on performance upgrades and reliability improvements. Today, he specializes in evaluating used vehicles through the lens of real-world ownership and enthusiast needs. A longtime fan of Porsche, Eugene especially appreciates vehicles that blend durability with driving enjoyment.