MERCEDES M8 (2018)
Running costs, common problems, and reliability data based on 111 real MOT tests in 2024.
MOT Pass Rate
79%
Total Tests (2024)
111
Avg Mileage
198,084 mi
Est. Annual Cost
£1,990
Is the 2018 MERCEDES M8 reliable?
Average reliability. Expect some repairs as it ages. That's close to the national average of 82%. It falls below the MERCEDES brand average of 87%.
At 6 years old, 79% of MERCEDES M8s from 2018 passed their MOT first time in 2024. That's based on 111 tests across the UK. The average mileage at this age is 198,084 miles.
How does the 2018 MERCEDES M8 compare?
Mileage Analysis
The average 2018 MERCEDES M8 has 198,084 miles on the clock, which is well above the expected 44,400 miles for a 6-year-old car. Check service history carefully, as high-mileage cars need consistent maintenance to stay reliable.
Best year to buy a MERCEDES M8?
The most reliable year is the 2019 model with a 82% MOT pass rate, while the 2017 model has the lowest at 76%. The 2018 sits between the two at 79%.
How much does a 2018 MERCEDES M8 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.
MERCEDES M8 by Year
Checking a specific MERCEDES M8?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2018 MERCEDES M8
The 2018 MERCEDES M8 is a family car with a 2143cc diesel engine. 111 of these vehicles were MOT tested in 2024, making it a rare model on UK roads. It sits in the bottom 96% of 2018 cars for MOT pass rates.
With an average of 198,084 miles at 6 years old, MERCEDES M8 owners cover more miles than the average driver. High-mileage examples should be checked carefully for wear on suspension, brakes, and drivetrain components.
2018 MERCEDES M8 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 £1,245 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 MERCEDES M8?
Total estimated annual running cost is £1,990 (£166/month), broken down as £1245 fuel, £190 road tax, £55 MOT, and £500 predicted repairs. Repair costs are moderate, reflecting the 79% pass rate. Keeping on top of servicing will help avoid surprises.
MERCEDES M8 Reliability Trend
Newer MERCEDES M8s show better MOT pass rates than older ones, with an average improvement of 5 percentage points.
Buying a Used 2018 MERCEDES M8
At 6 years old, the MERCEDES M8 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 2019 model has the highest pass rate at 82%.
Alternatives to the 2018 MERCEDES M8
If reliability is your priority, there are 4 similar cars with a higher MOT pass rate. Here are comparable diesel cars with similar engines:
- VOLKSWAGEN GOLF (2018) 92% pass rate (+13%) from 111,972 tests
- FORD TRANSIT (2017) 81% pass rate (+2%) from 80,031 tests
- FORD KUGA (2019) 91% pass rate (+12%) from 72,831 tests
- KIA SPORTAGE (2016) 85% pass rate (+6%) from 66,048 tests