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MERCEDES B-CLASS (2018)

Running costs, common problems, and reliability data based on 6,729 real MOT tests in 2024.

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MOT Pass Rate

90%

Total Tests (2024)

6,729

Avg Mileage

39,021 mi

Est. Annual Cost

£1,582

Is the 2018 MERCEDES B-CLASS reliable?

Excellent reliability. Very few MOT failures. That's 8 points above the national average of 82%.

At 6 years old, 90% of MERCEDES B-CLASSs from 2018 passed their MOT first time in 2024. That's based on 6,729 tests across the UK. The average mileage at this age is 39,021 miles.

How does the 2018 MERCEDES B-CLASS compare?

Rank among all 2018 cars342th out of 649(top 53%)
Rank among all MERCEDES models621th out of 1,408(top 44%)
vs national average+8% (82% avg)
vs 2018 cars average+1% (89% avg)
vs MERCEDES average+3% (87% avg)

Mileage Analysis

The average 2018 MERCEDES B-CLASS has 39,021 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 B-CLASS?

The most reliable year is the 2019 model with a 93% MOT pass rate, while the 2006 model has the lowest at 71%. The 2018 sits between the two at 90%.

How much does a 2018 MERCEDES B-CLASS cost to run?

⛽Fuel (Petrol, 1595cc)
£1,137
🏛️Road Tax
£190
🔧MOT Test
£55
🛠️Predicted Repairs
£200
Total per year£1,582
Per month£132/mo

Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.

MERCEDES B-CLASS by Year

YearPass RateTestsAvg Mileage
202098%4723,364 mi
201993%91229,781 mi
201890%6,72939,021 mi
201788%9,69348,392 mi
201687%9,65755,381 mi
201586%9,87164,066 mi
201483%15,38272,344 mi
201382%13,42178,118 mi
201281%11,09283,827 mi
201173%6,77984,302 mi
201074%8,81990,612 mi
200974%8,27795,335 mi
200871%6,925100,673 mi
200772%5,184101,539 mi
200671%4,235103,535 mi
200573%805105,799 mi

Checking a specific MERCEDES B-CLASS?

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About the 2018 MERCEDES B-CLASS

The 2018 MERCEDES B-CLASS is a small family car with a 1595cc petrol engine. 6,729 of these vehicles were MOT tested in 2024, making it a reasonably common sight 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 39,021 miles at 6 years old, MERCEDES B-CLASS owners drive about as much as the UK average.

2018 MERCEDES B-CLASS Fuel Costs

The 1595cc petrol engine offers a reasonable balance between performance and economy. Expect around 42 mpg in mixed driving, which works out to roughly £1,137 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 MERCEDES B-CLASS?

Total estimated annual running cost is £1,582 (£132/month), broken down as £1137 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.

MERCEDES B-CLASS Reliability Trend

Newer MERCEDES B-CLASSs show better MOT pass rates than older ones, with an average improvement of 14 percentage points.

Buying a Used 2018 MERCEDES B-CLASS

At 6 years old, the MERCEDES B-CLASS 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 93%. With 6,729 MOT tests in our data, there's strong statistical confidence in these figures.

Alternatives to the 2018 MERCEDES B-CLASS

The MERCEDES B-CLASS is actually the most reliable option among similar petrol small family cars from this era. Here are comparable petrol cars with similar engines: