Infiniti Ex (2012)
Estimated running costs and MOT pass rates from 61 MOT tests in 2024.
Annual Cost
£2,491
£208/month
MOT Pass Rate
82%
Good
Road Tax
£410
Estimated/year
Est. Insurance
Grp 30-42
2993cc Diesel
Solid Option
82% pass rate, £2,491/year to run. Close to the average across all models.
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Annual Running Costs
~40 mpg
Estimated CO2 band
Estimates based on 7,400 miles/year (UK average), diesel at 199.33p 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
Good reliability. Occasional issues but generally solid. That's close to the average of 82% across all models in our data. It falls below the Infiniti brand average of 87%.
82% of MOT tests on Infiniti Exs from 2012 ended in a pass in 2024, when they were about 12 years old. That's based on 61 tests across the UK, retests included. The average mileage recorded at those tests was 90,539 miles.
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How Does It Compare?
Mileage Analysis
90,539
Average miles
88,800
Expected for age
The average 2012 Infiniti Ex had 90,539 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 Ex
The 2012 Infiniti Ex is a premium performance car. Our records list a 2993cc diesel engine, though engines vary between versions. 61 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 beats that benchmark.
With an average of 90,539 miles recorded at its 2024 MOT tests, Infiniti Ex owners drive about as much as the UK average.
2012 Infiniti Ex Fuel Costs
The 2993cc diesel engine is on the larger side, so fuel won't be this car's strong point. Expect around 40 mpg in mixed driving, which works out to roughly £1,676 per year with diesel at 199.33p per litre (GOV.UK weekly average, week of 19 October 2026; based on 7,400 miles per year). Diesel cars of this age should have their DPF (diesel particulate filter) checked, as replacements can be costly.
What does it cost to own a 2012 Infiniti Ex?
Total estimated annual running cost is £2,491 (£208/month), broken down as £1,676 fuel, £410 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 82% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 2012 Infiniti Ex
At 14 years old, the Infiniti Ex 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 61 tests in our data, these figures should be treated as indicative rather than definitive.
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.
DPF (Diesel Particulate Filter)
Watch outShort journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.
Turbo Wear
Watch outDiesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.
EGR Valve
Watch outExhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.
Dual Mass Flywheel
Watch outLarger diesel engines put extra strain on the dual mass flywheel. Listen for rattling at idle. Replacement with clutch is £800-£1,500.
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
Medium riskWith an average of 91k 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 Ex 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 Ex(2012) | 82% | £1,676 | £410 | Grp 30-42 | £2,491 |
| Land Rover Range Rover(2013) | 88% | £1,676 | £410 | Grp 30-42 | £2,491same |
| Audi A4(2011) | 82% | £1,676 | £410 | Grp 30-42 | £2,491same |
| Jaguar XF(2014) | 84% | £1,676 | £410 | Grp 30-42 | £2,491same |
| Audi A5(2013) | 85% | £1,676 | £410 | Grp 30-42 | £2,491same |
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 Ex
Is the 2012 Infiniti Ex reliable?
Good reliability. Occasional issues but generally solid. 82% of MOT tests on 2012 Infiniti Exs ended in a pass, from 61 tests (DVSA MOT data for tests in 2024, retests included). That's level with the average of 82% across all models in the same data.
How much does a 2012 Infiniti Ex cost to run?
Our estimate is £2,491 a year (£208 a month): £1,676 fuel, £410 road tax, £55 MOT and £350 predicted repairs, based on 7,400 miles a year. Insurance is not included.
What is the MOT pass rate for a 2012 Infiniti Ex?
82% of 61 MOT tests on the 2012 Infiniti Ex ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 334th of 650 models first registered in 2012 (bottom half).
What is the average mileage for a 2012 Infiniti Ex?
The average mileage recorded at MOT tests on the 2012 Infiniti Ex is 90,539 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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