INFINITI M (2014)
Running costs, reliability data, and common problems from 62 real MOT tests.
Annual Cost
£2,607
£217/month
MOT Pass Rate
92%
Excellent
Road Tax
£760
Based on CC/year
Insurance
Grp 35-50
3498cc Hybrid
Great Choice
92% pass rate, £2607/year to run. 10 points above average.
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Annual Running Costs
~30 mpg
Based on 3498cc
Low estimate due to excellent reliability
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.
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Reliability Verdict
Excellent reliability. Very few MOT failures. That's 10 points above the national average of 82%. It also outperforms the INFINITI brand average of 87%.
At 12 years old, 92% of INFINITI Ms from 2014 passed their MOT first time in 2026. That's based on 62 tests across the UK. The average mileage at this age is 79,054 miles.
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Mileage Analysis
79,054
Average miles
88,800
Expected for age
The average 2014 INFINITI M has 79,054 miles on the clock, which is in line with the expected 88,800 miles for a 12-year-old car, suggesting normal everyday use.
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INFINITI M by Year
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About the 2014 INFINITI M
The 2014 INFINITI M is a premium performance with a 3498cc hybrid engine. 62 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 21% of all 2014 cars for reliability.
With an average of 79,054 miles at 12 years old, INFINITI M owners drive about as much as the UK average.
2014 INFINITI M Fuel Costs
The 3498cc hybrid 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 £1,592 per year at current hybrid prices of 142p per litre (based on 7,400 miles per year). As a hybrid, real-world fuel costs will vary significantly depending on how much electric-only driving you do.
What does it cost to own a 2014 INFINITI M?
Total estimated annual running cost is £2,607 (£217/month), broken down as £1592 fuel, £760 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 92% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
INFINITI M Reliability Trend
Newer INFINITI Ms show better MOT pass rates than older ones, with an average improvement of 6 percentage points.
Buying a Used 2014 INFINITI M
At 12 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. Note: with only 62 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2014 INFINITI M's fuel type, age, and engine size, these are the most likely problem areas to check.
Hybrid Battery Health
Watch outAfter 12 years, hybrid battery capacity may have reduced. A full replacement costs £2,000-£4,000, though reconditioning is cheaper at £500-£1,500.
Inverter and Power Electronics
Medium riskThe inverter converts DC to AC for the electric motor. Failures are expensive (£1,500+) but relatively rare. Listen for unusual buzzing sounds.
Regenerative Braking
Medium riskBrake discs can corrode from reduced use (the electric motor handles most braking). Surface rust is normal but deep pitting needs attention.
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.
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 2014 INFINITI M stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| INFINITI M(2014) | 92% | £1592 | £760 | Grp 35-50 | £2607 |
| MERCEDES S-CLASS(2016) | 91% | £1592 | £250 | Grp 35-50 | £2097-£510 |
| LEXUS RX(2014) | 91% | £1592 | £250 | Grp 35-50 | £2097-£510 |
| LEXUS GS(2016) | 94% | £1592 | £250 | Grp 35-50 | £2097-£510 |
| BMW 740(2014) | 91% | £1592 | £250 | Grp 30-42 | £2097-£510 |
Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.
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