Photo: Wikimedia Commons (CC)
Every generation
Power
0–62 mph (0–100 km/h)
Top speed (235 km/h)
What owners say
Our take, from owner reports
Owner sentiment is generally positive, with the M series praised for its powerful and reliable V8 and V6 engines, engaging driving dynamics, and comfortable, well-equipped interiors.
7 problems reported (3 very frequent, 2 recurrent, 2 isolated) · high confidence
Problems owners report
- Very frequentHigh fuel consumption
Reported real-world fuel economy of 16-18 MPG in city/spirited driving and 22 MPG on highway for V8 models; described as "terrible" and a major ongoing cost.
- Very frequentExpensive/Recurring Oil Leaks
Valve cover gaskets are cited as a frequent failure point, with OEM replacements noted as expensive (~$400 each).
- Very frequentPremium Fuel Requirement
The 4.5L and 5.6L V8 engines require or strongly recommend 93 octane fuel for performance and engine health, adding significantly to running costs.
+ 4 more issuesShow fewer
- RecurrentSuspension Wear
Lightweight aluminum suspension components noted as "not that durable" and expensive to replace, leading to a "clunky" feel over bumps at higher mileage.
- RecurrentOutdated Infotainment System
Described as "ancient" and a weak point compared to competitors, though the physical controls are appreciated.
- IsolatedElectrical/Gremlin Issues
Isolated but severe reports of unexplained electrical problems affecting multiple systems (e.g., transmission behavior, sunroof operation) following unrelated repairs, suggesting complex wiring or module vulnerabilities.
- IsolatedAuxiliary Cooling Fan Failure
Mentioned as a cause of overheating when the air conditioning is used in hot climates.
The version owners recommend
Insufficient owner data available to declare a consensus "best" version. Feedback is split between generations and engines. The first-generation M45 (2006-2010) is highlighted for its "very strong" 4.5L V8 and being a "blast to drive." The second-generation M37/M56 (2011-2013) is noted for improved interior comfort and space over the G-series sedans. Choice appears dependent on an owner's priority for raw V8 power versus the updated chassis and features of the later models.
Competitors to consider
Owners compare it most often with the Lexus GS (specifically GS 430), BMW 5 Series, Audi A6 and Lexus LS 460.
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Overall sentiment
Owner sentiment is generally positive, with the M series praised for its powerful and reliable V8 and V6 engines, engaging driving dynamics, and comfortable, well-equipped interiors. The vehicles are consistently described as fun to drive, offering significant performance for the price, especially on the used market. However, this enthusiasm is tempered by very frequent and strong consensus on high ownership costs, including poor fuel economy, expensive premium fuel requirements, and costly repairs for specific, recurring mechanical and electrical issues as mileage increases. The sentiment is one of a rewarding but demanding ownership experience, suitable for those who prioritize performance and can budget for its associated expenses.
Positioning vs competitors
Positioned as a more performance-oriented and engaging alternative to the Lexus GS, with owners noting the M is "more fun to drive" but the GS is "better built." Compared to German rivals like the BMW 5 Series and Audi A6, the M is often seen as offering comparable or superior performance (particularly the V8 models) at a lower purchase price on the used market, but with an older, less polished infotainment system and potentially higher long-term maintenance costs than a Lexus. It is viewed as a value proposition for performance, not for cutting-edge technology or ultimate luxury refinement.
Recommended configurations
AWD models (denoted by 'x' suffix, e.g., M56x) are mentioned for improved traction. A thorough pre-purchase inspection by a mechanic familiar with Infiniti/Nissan vehicles is universally emphasized, specifically to check for oil leaks, timing chain condition, and electrical system functionality. Owners strongly recommend budgeting for premium (91+ octane) fuel and setting aside a significant maintenance fund for repairs common at higher mileages.
General recommendations
Suitable for driving enthusiasts seeking a high-performance, full-size sedan at a depreciated price who can comfortably afford ongoing fuel and repair costs. NOT recommended as a first car, for budget-conscious buyers, or for those seeking maximum reliability with minimal maintenance costs. Essential to verify maintenance history, with a clear record of oil changes every 5,000 miles being a critical positive indicator. Negotiate purchase price aggressively to account for imminent high-mileage service items. Consider an independent Infiniti specialist or Nissan dealership for more affordable servicing compared to Infiniti dealers.
Remarks
The platform and engines (VQ35DE/VQ37VHR, VK45DE/VK56VD) are shared with other Nissan/Infiniti models (e.g., 350Z/G37, Titan), which aids in parts availability and mechanic familiarity. The consensus on reliability is conditional: these powertrains are described as "bullet-proof" and "very reliable" *only* with meticulous, timely maintenance. Overheating is particularly damaging and must be avoided. The high cost of ownership: fuel, premium parts, and labor: is the dominant theme in long-term owner reports, overshadowing the initial purchase value. Analysis based on owner discussions covering first-generation (M35/M45) and second-generation (M37/M56) models.
Generation by generation
Owner insights per generation and US complaint/recall records (NHTSA).
Complaints and recalls by model yearSource: NHTSA (US)Show table
| Year | Complaints | Recalls | Most-reported area |
|---|---|---|---|
| 2004 | 2 | 0 | fuel system |
| 2003 | 2 | 0 | fuel system |
Complaint counts come from owner reports filed with the US National Highway Traffic Safety Administration. Higher-selling years naturally accumulate more complaints.
Specifications
Enthusiast code: Y50
35 i V6 24V
3.5L 6-cylinder · 280 hp · AWD · automatic
Built 2005–2008