KIA STONIC (2018)
Running costs, common problems, and reliability data based on 11,258 real MOT tests in 2024.
MOT Pass Rate
90%
Total Tests (2024)
11,258
Avg Mileage
42,938 mi
Est. Annual Cost
£1,350
Is the 2018 KIA STONIC reliable?
Excellent reliability. Very few MOT failures. That's 8 points above the national average of 82%. It also outperforms the KIA brand average of 86%.
At 6 years old, 90% of KIA STONICs from 2018 passed their MOT first time in 2024. That's based on 11,258 tests across the UK. The average mileage at this age is 42,938 miles.
How does the 2018 KIA STONIC compare?
Mileage Analysis
The average 2018 KIA STONIC has 42,938 miles on the clock, which is in line with the expected 44,400 miles for a 6-year-old car, suggesting normal everyday use.
Best year to buy a KIA STONIC?
The most reliable year is the 2021 model with a 97% MOT pass rate, while the 2017 model has the lowest at 89%. The 2018 sits between the two at 90%.
How much does a 2018 KIA STONIC cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
KIA STONIC by Year
Checking a specific KIA STONIC?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2018 KIA STONIC
The 2018 KIA STONIC is a small family car with a 1582cc diesel engine. 11,258 of these vehicles were MOT tested in 2024, making it one of the most commonly tested cars on UK roads. Among all cars from 2018, the average MOT pass rate is 89%, and this model beats that benchmark.
With an average of 42,938 miles at 6 years old, KIA STONIC owners drive about as much as the UK average.
2018 KIA STONIC Fuel Costs
The 1582cc diesel engine offers a reasonable balance between performance and economy. Expect around 55 mpg in mixed driving, which works out to roughly £905 per year at current diesel prices of 148p per litre (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 2018 KIA STONIC?
Total estimated annual running cost is £1,350 (£113/month), broken down as £905 fuel, £190 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 90% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
KIA STONIC Reliability Trend
Newer KIA STONICs show better MOT pass rates than older ones, with an average improvement of 5 percentage points.
Buying a Used 2018 KIA STONIC
At 6 years old, the KIA STONIC offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. If you're flexible on year, the 2021 model has the highest pass rate at 97%. With 11,258 MOT tests in our data, there's strong statistical confidence in these figures.
Alternatives to the 2018 KIA STONIC
If reliability is your priority, there are 2 similar cars with a higher MOT pass rate. Here are comparable diesel cars with similar engines:
- VOLKSWAGEN GOLF (2017) 91% pass rate (+1%) from 127,682 tests
- FORD FOCUS (2019) 89% pass rate (-1%) from 93,803 tests
- MERCEDES A (2019) 91% pass rate (+1%) from 89,588 tests
- MERCEDES A-CLASS (2017) 88% pass rate (-2%) from 82,055 tests