INFINITI M (2012)
Running costs, reliability data, and common problems from 155 real MOT tests.
Annual Cost
£2,907
£242/month
MOT Pass Rate
78%
Average
Road Tax
£760
Based on CC/year
Insurance
Grp 35-50
3696cc Petrol
Check Carefully
78% pass rate, £2907/year to run. Close to the national average.
Check a specific INFINITI M
Enter a reg plate for full MOT history, mileage check, health score, running costs, and reliability data. Free, instant, no signup.
Annual Running Costs
~30 mpg
Based on 3696cc
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.
Get an insurance quote for this INFINITI M
Compare quotes and find the best deal
Reliability Verdict
Average reliability. Expect some repairs as it ages. That's close to the national average of 82%. It falls below the INFINITI brand average of 87%.
At 14 years old, 78% of INFINITI Ms from 2012 passed their MOT first time in 2026. That's based on 155 tests across the UK. The average mileage at this age is 104,264 miles.
Got a INFINITI M you're looking at?
Enter the reg plate to check its specific MOT history, mileage, and health score.
How Does It Compare?
Mileage Analysis
104,264
Average miles
103,600
Expected for age
The average 2012 INFINITI M has 104,264 miles on the clock, which is in line with the expected 103,600 miles for a 14-year-old car, suggesting normal everyday use.
Looking at a specific INFINITI M?
Enter its reg plate for a free check with full MOT history, mileage verification, and predicted costs.
Best Year to Buy?
The most reliable year is the 2014 model with a 92% MOT pass rate, while the 2012 model has the lowest at 78%. Consider a different year if reliability is a priority.
INFINITI M by Year
Similar Cars to Consider
Check a Specific Infiniti M
Enter a reg plate to get the full MOT history, health score, and mileage verification.
Upgrade to Premium (£4.99) for stolen, finance, and write-off checks.
About the 2012 INFINITI M
The 2012 INFINITI M is a premium performance with a 3696cc petrol engine. 155 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. Among all cars from 2012, the average MOT pass rate is 78%, and this model falls short of that benchmark.
With an average of 104,264 miles at 14 years old, 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 £1,592 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).
What does it cost to own a 2012 INFINITI M?
Total estimated annual running cost is £2,907 (£242/month), broken down as £1592 fuel, £760 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.
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 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
Based on the 2012 INFINITI M's fuel type, age, and engine size, these are the most likely problem areas to check.
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 annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| INFINITI M(2012) | 78% | £1592 | £760 | Grp 35-50 | £2907 |
| MERCEDES E(2010) | 80% | £1592 | £250 | Grp 35-50 | £2247-£660 |
| PORSCHE CAYENNE(2014) | 91% | £1592 | £250 | Grp 35-50 | £2097-£810 |
| PORSCHE 911(2014) | 96% | £1592 | £250 | Grp 35-50 | £2097-£810 |
| BENTLEY CONTINENTAL(2014) | 97% | £1592 | £250 | Grp 35-50 | £2097-£810 |
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.
Related Infiniti Models
Explore other Infiniti cars or similar models in the same category.
Related Guides
In-depth articles relevant to the Infiniti M.
Cheapest Cars to Run in 2026: Real Data from 19.8 Million MOT Tests
9 min read
Running CostsCheapest Cars to Insure in the UK: Insurance Groups 1-10
9 min read
Running CostsCheapest Cars to Run in the UK: A Complete Cost Breakdown
11 min read
Buying GuideFord Fiesta Common Problems (2026): What to Check Before Buying
13 min read
ReliabilityFord Puma Problems: 7 Issues Owners Report (2026)
13 min read
Check a specific INFINITI M
Enter the reg to see its MOT history, mileage check, and predicted costs.
Premium History Check
Buying a INFINITI M? Our premium check covers:
- Stolen check (PNC)
- Outstanding finance
- Write-off history (Cat A/B/N/S)
- Previous owners count
Competitors charge £10-£20 for the same data