Infiniti M (2012)
Estimated running costs and MOT pass rates from 155 MOT tests in 2024.
Annual Cost
£3,303
£275/month
MOT Pass Rate
78%
Average
Road Tax
£790
Estimated/year
Est. Insurance
Grp 35-50
3696cc Petrol
Check Carefully
78% pass rate, £3,303/year to run. Close to the average across all models.
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Annual Running Costs
~30 mpg
Estimated CO2 band
Estimates based on 7,400 miles/year (UK average), petrol at 174.57p a litre (GOV.UK weekly average, week of 19 October 2026), GOV.UK road tax rates and repair likelihood from MOT data. Insurance not included.
Reliability Verdict
Average reliability. Expect some repairs as it ages. That's close to the average of 82% across all models in our data. It falls below the Infiniti brand average of 87%.
78% of MOT tests on Infiniti Ms from 2012 ended in a pass in 2024, when they were about 12 years old. That's based on 155 tests across the UK, retests included. The average mileage recorded at those tests was 104,264 miles.
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How Does It Compare?
Mileage Analysis
104,264
Average miles
88,800
Expected for age
The average 2012 Infiniti M had 104,264 miles on the clock at its 2024 MOT, which is in line with the expected 88,800 miles for a 12-year-old car, suggesting normal everyday use.
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About the 2012 Infiniti M
The 2012 Infiniti M is a premium performance car. Our records list a 3696cc petrol engine, though engines vary between versions. 155 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. Among all models from 2012, the average MOT pass rate is 78%, and this model matches that benchmark.
With an average of 104,264 miles recorded at its 2024 MOT tests, Infiniti M owners drive about as much as the UK average.
2012 Infiniti M Fuel Costs
The 3696cc petrol engine is on the larger side, so fuel won't be this car's strong point. Expect around 30 mpg in mixed driving, which works out to roughly £1,958 per year with petrol at 174.57p per litre (GOV.UK weekly average, week of 19 October 2026; based on 7,400 miles per year).
What does it cost to own a 2012 Infiniti M?
Total estimated annual running cost is £3,303 (£275/month), broken down as £1,958 fuel, £790 road tax, £55 MOT, and £500 predicted repairs. Repair costs are moderate, reflecting the 78% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 2012 Infiniti M
At 14 years old, the Infiniti M is firmly in budget territory. Purchase prices are low, but check for rust, worn suspension bushes, and electrical gremlins. A full service history is especially valuable at this age.
Common Issues to Watch For
These are typical issues for cars of this age, fuel type and engine size, not faults recorded on this model's MOT tests. Use them as a checklist when you view one.
Timing Chain / Belt
Watch outAt 14 years old, check whether the timing belt has been replaced (typically due every 5-7 years or 60,000-100,000 miles). A snapped belt can destroy the engine.
Oil Consumption
Medium riskLarger petrol engines can develop higher oil consumption as they age. Check the oil level and look for blue smoke from the exhaust.
Rust and Corrosion
Watch outAt 10+ years, check wheel arches, sills, subframe, and brake lines for rust. Structural corrosion is an MOT failure. Prevention is far cheaper than repair.
Suspension Bushings
Watch outRubber suspension bushes harden and crack with age, causing knocking noises and vague handling. A full refresh costs £300-£800 depending on the car.
Clutch Wear
Watch outWith an average of 104k miles, clutch replacement may be due (typical lifespan 60,000-100,000 miles). Budget £400-£800 for a new clutch kit.
Brake Discs and Pads
Medium riskHigh-mileage cars often need brake disc replacement, not just pads. A full set of discs and pads costs £200-£500 per axle.
Service History
Low riskAlways request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.
Running Costs Compared
How the 2012 Infiniti M stacks up against similar cars for estimated annual running costs, insurance group, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Est. Ins. Group | Total/yr |
|---|---|---|---|---|---|
| Infiniti M(2012) | 78% | £1,958 | £790 | Grp 35-50 | £3,303 |
| Mercedes E(2010) | 80% | £1,958 | £790 | Grp 35-50 | £3,153-£150 |
| Porsche Cayenne(2014) | 91% | £1,958 | £790 | Grp 35-50 | £3,003-£300 |
| Porsche 911(2014) | 96% | £1,958 | £790 | Grp 35-50 | £3,003-£300 |
| Bentley Continental(2014) | 97% | £1,958 | £790 | Grp 35-50 | £3,003-£300 |
Estimates based on 7,400 miles/year, GOV.UK average pump prices for the week of 19 October 2026, GOV.UK road tax rates and MOT data. Insurance groups are our rough estimate from engine size, not official groups. Actual costs vary by driver, location, and usage.
Questions about the 2012 Infiniti M
Is the 2012 Infiniti M reliable?
Average reliability. Expect some repairs as it ages. 78% of MOT tests on 2012 Infiniti Ms ended in a pass, from 155 tests (DVSA MOT data for tests in 2024, retests included). That's 4 points below the average of 82% across all models in the same data.
How much does a 2012 Infiniti M cost to run?
Our estimate is £3,303 a year (£275 a month): £1,958 fuel, £790 road tax, £55 MOT and £500 predicted repairs, based on 7,400 miles a year. Insurance is not included.
What is the MOT pass rate for a 2012 Infiniti M?
78% of 155 MOT tests on the 2012 Infiniti M ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 442nd of 650 models first registered in 2012 (bottom half).
What is the average mileage for a 2012 Infiniti M?
The average mileage recorded at MOT tests on the 2012 Infiniti M is 104,264 miles, which is in line with the expected 88,800 miles for a 12-year-old car, suggesting normal everyday use.
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