MERCEDES GLC (2018)
Running costs, common problems, and reliability data based on 40,494 real MOT tests in 2024.
MOT Pass Rate
91%
Total Tests (2024)
40,494
Avg Mileage
51,301 mi
Est. Annual Cost
£1,690
Is the 2018 MERCEDES GLC reliable?
Excellent reliability. Very few MOT failures. That's 9 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 6 years old, 91% of MERCEDES GLCs from 2018 passed their MOT first time in 2024. That's based on 40,494 tests across the UK. The average mileage at this age is 51,301 miles.
How does the 2018 MERCEDES GLC compare?
Mileage Analysis
The average 2018 MERCEDES GLC has 51,301 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 MERCEDES GLC?
The most reliable year is the 2022 model with a 96% MOT pass rate, while the 2015 model has the lowest at 89%. The 2018 sits between the two at 91%.
How much does a 2018 MERCEDES GLC 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 GLC by Year
Checking a specific MERCEDES GLC?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2018 MERCEDES GLC
The 2018 MERCEDES GLC is a large car with a 2987cc diesel engine. 40,494 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 51,301 miles at 6 years old, MERCEDES GLC owners drive about as much as the UK average.
2018 MERCEDES GLC Fuel Costs
The 2987cc 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 MERCEDES GLC?
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 91% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
MERCEDES GLC Reliability Trend
Newer MERCEDES GLCs show better MOT pass rates than older ones, with an average improvement of 5 percentage points.
Buying a Used 2018 MERCEDES GLC
At 6 years old, the MERCEDES GLC 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 2022 model has the highest pass rate at 96%. With 40,494 MOT tests in our data, there's strong statistical confidence in these figures.
Alternatives to the 2018 MERCEDES GLC
The MERCEDES GLC is actually the most reliable option among similar diesel large cars from this era. Here are comparable diesel cars with similar engines:
- MERCEDES E (2019) 90% pass rate (-1%) from 41,000 tests
- AUDI A5 (2017) 89% pass rate (-2%) from 33,531 tests
- FORD RANGER (2019) 87% pass rate (-4%) from 32,194 tests
- LAND ROVER RANGE ROVER VELAR (2018) 91% pass rate (same) from 29,640 tests