AUDI Q8 (2018)
Running costs, common problems, and reliability data based on 1,769 real MOT tests in 2024.
MOT Pass Rate
95%
Total Tests (2024)
1,769
Avg Mileage
53,855 mi
Est. Annual Cost
£1,690
Is the 2018 AUDI Q8 reliable?
Excellent reliability. Very few MOT failures. That's 13 points above the national average of 82%. It also outperforms the AUDI brand average of 90%.
At 6 years old, 95% of AUDI Q8s from 2018 passed their MOT first time in 2024. That's based on 1,769 tests across the UK. The average mileage at this age is 53,855 miles.
How does the 2018 AUDI Q8 compare?
Mileage Analysis
The average 2018 AUDI Q8 has 53,855 miles on the clock, 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.
Best year to buy a AUDI Q8?
The most reliable year is the 2021 model with a 97% MOT pass rate, while the 2019 model has the lowest at 94%. The 2018 sits between the two at 95%.
How much does a 2018 AUDI Q8 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.
AUDI Q8 by Year
Checking a specific AUDI Q8?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2018 AUDI Q8
The 2018 AUDI Q8 is a premium performance with a 2967cc diesel engine. 1,769 of these vehicles were MOT tested in 2024, making it a reasonably common sight on UK roads. It ranks in the top 16% of all 2018 cars for reliability.
With an average of 53,855 miles at 6 years old, AUDI Q8 owners cover more miles than the average driver.
2018 AUDI Q8 Fuel Costs
The 2967cc 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 £1,245 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 AUDI Q8?
Total estimated annual running cost is £1,690 (£141/month), broken down as £1245 fuel, £190 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 95% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
AUDI Q8 Reliability Trend
The AUDI Q8 has maintained consistent MOT pass rates across model years, varying by only 2 percentage points.
Buying a Used 2018 AUDI Q8
At 6 years old, the AUDI Q8 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%.
Alternatives to the 2018 AUDI Q8
The AUDI Q8 is actually the most reliable option among similar diesel premium performances from this era. Here are comparable diesel cars with similar engines:
- MERCEDES E (2019) 90% pass rate (-5%) from 41,000 tests
- MERCEDES GLC (2018) 91% pass rate (-4%) from 40,494 tests
- AUDI A5 (2017) 89% pass rate (-6%) from 33,531 tests
- FORD RANGER (2019) 87% pass rate (-8%) from 32,194 tests