The Infiniti M56 draws 1.23 complaints per production run against 3.73 for the average car — better than typical. The worst model year is 2011 at 1.22 complaints per run; the best is 2012 at 1 — a 1.2-fold gap between two cars wearing the same badge. Failures cluster at 7 years, so only 18.8% of them fall inside the 4-year basic warranty.
Infiniti M56 years to avoid — and the best ones
The Infiniti M56 year to avoid is 2011, at 1.22 complaints per production run. The best is 2012 at 1 — 1.2 times cleaner for a car wearing the same badge. Both figures are rates, not totals: a raw count only tells you which year sold well, so the best-selling year always looks like the worst car. Dividing by the number of production runs strips sales volume out and leaves the fault rate.
| Model year | Per run | Complaints | Runs | Enough history? |
|---|---|---|---|---|
| 2012 | 3 | 3 | yes | |
| 2011 | 11 | 9 | yes |
Among the 2 Infiniti M56 years with enough history, the three to walk away from are 2011, 2012; the three worth hunting are 2012, 2011. Anything marked «too new» sits outside the ranking on purpose — complaints keep arriving for a decade after a car is sold, so a 2026 build would look flawless next to a ten-year-old one and comparing them would be dishonest.
When it starts to break
Not the calendar year the complaint was filed — the age of the car when it failed. That age decides who pays: inside the warranty the manufacturer does, outside it you do.
| Age at failure | Complaints | Running total | Warranty |
|---|---|---|---|
| 2 years | 12.5% | covered | |
| 3 years | 18.8% | covered | |
| 4 years | 25% | you pay | |
| 6 years | 37.5% | you pay | |
| 7 years | 50% | you pay | |
| 8 years | 75% | you pay | |
| 10 years | 93.8% | you pay | |
| 12 years | 100% | you pay |
Basic warranty on this car is 4 years / 50,000 miles. Only 18.8% of reported failures happen inside it — the remaining 81.2% come out of the owner's pocket. Powertrain cover (6 years / 70,000 miles) reaches further, but it only covers engine and transmission, and most complaints here are not either.
What actually fails — and at what age
Ordered by how often owners reported each system, with the age at which it typically goes. On a Infiniti M56 the early trouble is Seat Belts — reported at around 2 years, so a car still under warranty is the one to check for it. What waits further out is Power Train at 7.7 years — past every basic warranty, and the bill lands on whoever owns the car then.
| System | Complaints | Typical age | Crash | Fire |
|---|---|---|---|---|
| Power Train | 7.7 yrs | — | — | |
| Engine | 6.8 yrs | — | — | |
| Electrical System | 5 yrs | — | — | |
| Fuel/propulsion System | 8.7 yrs | — | — | |
| Air Bags | 7 yrs | — | — | |
| Steering | 6.5 yrs | — | — | |
| Unknown Or Other | 5 yrs | — | — | |
| Seat Belts | 2 yrs | — | — |
What else in this class
Same vehicle class as the Infiniti M56, so the comparison is fair — an estate against an estate, not against a coupé. These 6 share its class; open any of them to see its own build years and failure ages side by side with the M56.
| Same class as the M56 | Complaints on record | Recall campaigns | Years built |
|---|---|---|---|
| Toyota Camry | 163 | 1983–2026 | |
| Honda Accord | 415 | 1981–2026 | |
| Dodge Challenger | 77 | 1981–2026 | |
| Toyota Prius | 111 | 2001–2026 | |
| Hyundai Elantra | 116 | 1992–2026 | |
| Nissan Altima | 146 | 1993–2026 |
These are totals, not rates: a model that sold in millions collects more of both. Open one to see its complaints per production run — the figure this site is built on.
Good year or bad year — the VIN settles it.
- Check any VIN against complaints for its exact build year and plant
- Exact value for that car, adjusted for its mileage
- Full research report as a PDF you can hand to a mechanic
- Alerts if a recall lands on a car in your garage
- No ads, on every page
- No ads, no tracking — and much more
How we measure it
Reliability scores usually arrive as a number out of five with no working shown. The Infiniti M56 figure here comes out of 16 individual reports, and here is exactly how they were turned into a rate — two steps in it are arguable and you should be able to argue with them.
Rate, not total. Volume alone would decide the ranking, so we divide by the number of production runs — the distinct first-eleven-character VIN prefixes on record. The Infiniti M56 alone splits into 13 runs carrying 16 complaints — 1.23 per run against 3.73 for the market.
Age, not year. Incident date minus model year gives the age at failure, which is what the warranty question turns on. It is why our «worst year» rankings exclude anything built in the last 6 years — those cars simply have not had time to break yet.
What this is not. Filing with a federal regulator takes effort, so what you see are faults someone judged serious — not scratched paint, not running costs, not how nice the car is to live with. For the Infiniti M56 the file runs from 2011 to 2013, so the older years carry a full life of reports and the newest carry almost none.
Frequently asked questions
Is the Infiniti M56 reliable?
It draws 1.23 complaints per production run against 3.73 for the average car, so better than typical. Failures cluster around 7 years of age.
What are the best and worst years for the M56?
Worst is 2011 at 1.22 complaints per run; best is 2012 at 1. Years newer than 6 are excluded — they have not had time to accumulate complaints.
How long does a M56 last?
Complaints reach their halfway point at 7 years. That is when faults start being reported in volume, not when the car stops — but it is the point at which ownership starts costing money.
Will the warranty cover it?
Basic cover is 4 years / 50,000 miles, and 18.8% of reported failures fall inside it. The rest are yours.
What fails most often?
Power Train with 7 complaints, typically at 7.7 years of age.
Mark ForCar as a preferred source and our data shows up first in your Google results. One click, no account.