Infiniti Q50 (2015)

Estimated running costs and MOT pass rates from 1,436 MOT tests in 2024.

Annual Cost

£2,491

£208/month

MOT Pass Rate

83%

Good

Road Tax

£410

Estimated/year

Est. Insurance

Grp 25-38

2143cc Diesel

Solid Option

83% pass rate, £2,491/year to run. Close to the average across all models.

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Diesel2143cc11 years old1,436 tests82k miles avg

Annual Running Costs

Fuel (Diesel, 2143cc)

~40 mpg

£1,676

Road Tax

Estimated CO2 band

£410

MOT Test

£55

Predicted Repairs

£350

Total per year£2,491

Per month£208/mo

Per week£48/wk

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

83% MOT pass rate(Good)

0%All-model avg: 82%100%

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%.

83% of MOT tests on Infiniti Q50s from 2015 ended in a pass in 2024, when they were about 9 years old. That's based on 1,436 tests across the UK, retests included. The average mileage recorded at those tests was 82,491 miles.

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How Does It Compare?

Rank among 2015 models333rd of 515(bottom half)

Rank among Infiniti models36th of 47(bottom half)

vs average of all models+1%(82% avg)

vs 2015 models average+0%(83% avg)

vs Infiniti average-4%(87% avg)

Mileage Analysis

82,491

Average miles

66,600

Expected for age

The average 2015 Infiniti Q50 had 82,491 miles on the clock at its 2024 MOT, which is above the expected 66,600 miles for a 9-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.

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Best Year to Buy?

Of the years with at least 100 tests, the 2017 model has the highest MOT pass rate at 88%, while the 2014 model has the lowest at 82%. The 2015 scores 83%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.

Infiniti Q50 by Year

Year	Pass Rate	Tests	Avg Mileage
2019	100%	45	33,181 mi
2018	87%	522	56,669 mi
2017	88%	781	69,342 mi
2016	85%	1,196	77,912 mi
2015	83%	1,436	82,491 mi
2014	82%	749	88,032 mi
2013	78%	40	96,203 mi

Similar Cars to Consider

Volkswagen Golf

2015 · 1968cc Diesel

£2,077/year

89%

+6%

Vauxhall Astra

2013 · 1700cc Diesel

£2,227/year

79%

-4%

BMW 3 Series

2013 · 1995cc Diesel

£2,077/year

85%

+2%

Kia Sportage

2016 · 1700cc Diesel

£2,077/year

85%

+2%

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About the 2015 Infiniti Q50

The 2015 Infiniti Q50 is a premium car. Our records list a 2143cc diesel engine, though engines vary between versions. 1,436 MOT tests were recorded on this model in 2024, making it a reasonably common sight on UK roads. Among all models from 2015, the average MOT pass rate is 83%, and this model matches that benchmark.

With an average of 82,491 miles recorded at its 2024 MOT tests, Infiniti Q50 owners cover more miles than the average driver.

2015 Infiniti Q50 Fuel Costs

The 2143cc diesel engine offers a reasonable balance between performance and economy. 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 2015 Infiniti Q50?

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 83% pass rate. Keeping on top of servicing will help avoid surprises.

Infiniti Q50 Reliability Trend

Newer Infiniti Q50s pass their MOT more often than older ones, by 4 percentage points on average, which is mostly down to age and wear.

Buying a Used 2015 Infiniti Q50

At 11 years old, the Infiniti Q50 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. If you're flexible on year, the 2017 model has the highest pass rate at 88%.

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 out

Short journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.

Turbo Wear

Watch out

Diesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.

AdBlue System

Medium risk

Post-2015 diesels use AdBlue for emissions. Sensor failures and tank heater issues are common. Budget £200-£500 for repairs.

EGR Valve

Watch out

Exhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.

Dual Mass Flywheel

Watch out

Larger 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 out

At 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 out

Rubber 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 risk

With an average of 82k 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 risk

High-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 risk

Always 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 2015 Infiniti Q50 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 Q50(2015)	83%	£1,676	£410	Grp 25-38	£2,491
Volkswagen Golf(2015)	89%	£1,397	£275	Grp 18-32	£2,077-£414
Vauxhall Astra(2013)	79%	£1,397	£275	Grp 18-32	£2,227-£264
BMW 3 Series(2013)	85%	£1,397	£275	Grp 18-32	£2,077-£414
Kia Sportage(2016)	85%	£1,397	£275	Grp 18-32	£2,077-£414

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 2015 Infiniti Q50

Is the 2015 Infiniti Q50 reliable?

Good reliability. Occasional issues but generally solid. 83% of MOT tests on 2015 Infiniti Q50s ended in a pass, from 1,436 tests (DVSA MOT data for tests in 2024, retests included). That's 1 point above the average of 82% across all models in the same data.

How much does a 2015 Infiniti Q50 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 2015 Infiniti Q50?

83% of 1,436 MOT tests on the 2015 Infiniti Q50 ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 333rd of 515 models first registered in 2015 (bottom half).

Which year Infiniti Q50 has the best MOT pass rate?

Of the years with at least 100 tests, the 2017 Infiniti Q50 has the highest MOT pass rate at 88% and the 2014 the lowest at 82%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 2015 Infiniti Q50?

The average mileage recorded at MOT tests on the 2015 Infiniti Q50 is 82,491 miles, which is above the expected 66,600 miles for a 9-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.