INFINITI Q50 (2018)
Running costs, reliability data, and common problems from 522 real MOT tests.
Annual Cost
£2,192
£183/month
MOT Pass Rate
87%
Good
Road Tax
£195
Flat rate/year
Insurance
Grp 30-42
2997cc Petrol
Solid Option
87% pass rate, £2192/year to run. 5 points above average.
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Annual Running Costs
~30 mpg
Flat rate (post-2017)
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
Good reliability. Occasional issues but generally solid. That's close to the national average of 82%.
At 8 years old, 87% of INFINITI Q50s from 2018 passed their MOT first time in 2026. That's based on 522 tests across the UK. The average mileage at this age is 56,669 miles.
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How Does It Compare?
Mileage Analysis
56,669
Average miles
59,200
Expected for age
The average 2018 INFINITI Q50 has 56,669 miles on the clock, which is in line with the expected 59,200 miles for a 8-year-old car, suggesting normal everyday use.
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Best Year to Buy?
The most reliable year is the 2017 model with a 88% MOT pass rate, while the 2014 model has the lowest at 82%. The 2018 sits between the two at 87%.
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 with a 2997cc petrol engine. 522 of these vehicles were MOT tested in 2026, making it a less common model in the UK market. It sits in the bottom 76% of 2018 cars for MOT pass rates.
With an average of 56,669 miles at 8 years old, INFINITI Q50 owners drive about as much as the UK average.
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 £1,592 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).
What does it cost to own a 2018 INFINITI Q50?
Total estimated annual running cost is £2,192 (£183/month), broken down as £1592 fuel, £195 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 show better MOT pass rates than older ones, with an average improvement of 4 percentage points.
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
Based on the 2018 INFINITI Q50's fuel type, age, and engine size, these are the most likely problem areas to check.
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 annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| INFINITI Q50(2018) | 87% | £1592 | £195 | Grp 30-42 | £2192 |
| BMW 5 SERIES(2018) | 91% | £1592 | £190 | Grp 30-42 | £2037-£155 |
| LAND ROVER RANGE ROVER SPORT(2018) | 93% | £1592 | £190 | Grp 30-42 | £2037-£155 |
| BMW X3(2019) | 92% | £1592 | £190 | Grp 30-42 | £2037-£155 |
| MERCEDES GLC(2019) | 93% | £1592 | £190 | Grp 30-42 | £2037-£155 |
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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