Infiniti Q50 (2018)
Estimated running costs and MOT pass rates from 522 MOT tests in 2024.
Annual Cost
£2,563
£214/month
MOT Pass Rate
87%
Good
Road Tax
£200
Standard rate/year
Est. Insurance
Grp 30-42
2997cc Petrol
Solid Option
87% pass rate, £2,563/year to run. 5 points above average.
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Annual Running Costs
~30 mpg
Standard rate (from April 2017)
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. Cars registered from April 2017 pay the £200 standard rate, plus £440 a year for five years (from the second year) if they cost over £40,000 new (over £50,000 for electric cars).
Reliability Verdict
Good reliability. Occasional issues but generally solid. That's close to the average of 82% across all models in our data.
87% of MOT tests on Infiniti Q50s from 2018 ended in a pass in 2024, when they were about 6 years old. That's based on 522 tests across the UK, retests included. The average mileage recorded at those tests was 56,669 miles.
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How Does It Compare?
Mileage Analysis
56,669
Average miles
44,400
Expected for age
The average 2018 Infiniti Q50 had 56,669 miles on the clock at its 2024 MOT, which is above the expected 44,400 miles for a 6-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 2018 scores 87%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.
Infiniti Q50 by Year
Similar Cars to Consider
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About the 2018 Infiniti Q50
The 2018 Infiniti Q50 is a premium performance car. Our records list a 2997cc petrol engine, though engines vary between versions. 522 MOT tests were recorded on this model in 2024, making it a less common model in the UK market. Among all models from 2018, the average MOT pass rate is 89%, and this model falls short of that benchmark.
With an average of 56,669 miles recorded at its 2024 MOT tests, Infiniti Q50 owners cover more miles than the average driver.
2018 Infiniti Q50 Fuel Costs
The 2997cc 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 2018 Infiniti Q50?
Total estimated annual running cost is £2,563 (£214/month), broken down as £1,958 fuel, £200 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 87% 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 2018 Infiniti Q50
At 8 years old, this is a solid used buy if you find one with good service history. Depreciation has levelled off, so you won't lose much more value. Focus on condition over mileage. 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.
Timing Chain / Belt
Watch outAt 8 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.
Suspension Wear
Medium riskShock absorbers, springs, and anti-roll bar links typically need attention around this age. Listen for clunks over bumps and check for uneven tyre wear.
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 2018 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(2018) | 87% | £1,958 | £200 | Grp 30-42 | £2,563 |
| BMW 5 Series(2018) | 91% | £1,958 | £200 | Grp 30-42 | £2,413-£150 |
| Land Rover Range Rover Sport(2018) | 93% | £1,958 | £200 | Grp 30-42 | £2,413-£150 |
| BMW X3(2019) | 92% | £1,958 | £200 | Grp 30-42 | £2,413-£150 |
| Mercedes GLC(2019) | 93% | £1,958 | £200 | Grp 30-42 | £2,413-£150 |
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 2018 Infiniti Q50
Is the 2018 Infiniti Q50 reliable?
Good reliability. Occasional issues but generally solid. 87% of MOT tests on 2018 Infiniti Q50s ended in a pass, from 522 tests (DVSA MOT data for tests in 2024, retests included). That's 5 points above the average of 82% across all models in the same data.
How much does a 2018 Infiniti Q50 cost to run?
Our estimate is £2,563 a year (£214 a month): £1,958 fuel, £200 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 2018 Infiniti Q50?
87% of 522 MOT tests on the 2018 Infiniti Q50 ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 454th of 607 models first registered in 2018 (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 2018 Infiniti Q50?
The average mileage recorded at MOT tests on the 2018 Infiniti Q50 is 56,669 miles, which is above the expected 44,400 miles for a 6-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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