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MERCEDES UNCLASSIFIED (2021)

Running costs, common problems, and reliability data based on 270 real MOT tests in 2024.

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MOT Pass Rate

96%

Total Tests (2024)

270

Avg Mileage

14,108 mi

Est. Annual Cost

£1,690

Is the 2021 MERCEDES UNCLASSIFIED reliable?

Excellent reliability. Very few MOT failures. That's 14 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.

At 3 years old, 96% of MERCEDES UNCLASSIFIEDs from 2021 passed their MOT first time in 2024. That's based on 270 tests across the UK. The average mileage at this age is 14,108 miles.

How does the 2021 MERCEDES UNCLASSIFIED compare?

Rank among all 2021 cars599th out of 3,373(top 18%)
Rank among all MERCEDES models174th out of 1,408(top 12%)
vs national average+14% (82% avg)
vs 2021 cars average+4% (92% avg)
vs MERCEDES average+9% (87% avg)

Mileage Analysis

The average 2021 MERCEDES UNCLASSIFIED has 14,108 miles on the clock, which is below the expected 22,200 miles for a 3-year-old car. This suggests lighter use than average, which generally means less wear on major components.

How much does a 2021 MERCEDES UNCLASSIFIED cost to run?

⛽Fuel (Diesel, 2987cc)
£1,245
🏛️Road Tax
£190
🔧MOT Test
£55
🛠️Predicted Repairs
£200
Total per year£1,690
Per month£141/mo

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

MERCEDES UNCLASSIFIED by Year

YearPass RateTestsAvg Mileage
202196%27014,108 mi
202093%23717,059 mi
201995%17625,080 mi
201892%20240,291 mi
201791%20039,620 mi
201687%32645,907 mi
201591%25272,531 mi
201486%28983,046 mi
201389%24552,132 mi
201289%18566,863 mi
201190%12663,066 mi
201092%9894,655 mi
200979%174100,957 mi
200879%354111,482 mi
200781%259105,351 mi
200681%24095,112 mi
200579%273101,492 mi
200479%29891,119 mi
200373%178102,840 mi
200284%214129,941 mi
200173%107121,123 mi
200073%195116,472 mi
199978%223144,511 mi
199881%155139,571 mi
199766%65104,116 mi
199666%101175,170 mi
199578%45212,804 mi
199474%8685,110 mi
199389%47159,142 mi
199260%40117,020 mi
199173%33102,932 mi
199083%5895,507 mi

Checking a specific MERCEDES UNCLASSIFIED?

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About the 2021 MERCEDES UNCLASSIFIED

The 2021 MERCEDES UNCLASSIFIED is a large car with a 2987cc diesel engine. 270 of these vehicles were MOT tested in 2024, making it a less common model in the UK market. It ranks in the top 18% of all 2021 cars for reliability.

With an average of 14,108 miles at 3 years old, MERCEDES UNCLASSIFIED owners tend to use this car less than the typical driver.

2021 MERCEDES UNCLASSIFIED 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).

What does it cost to own a 2021 MERCEDES UNCLASSIFIED?

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 96% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

MERCEDES UNCLASSIFIED Reliability Trend

Newer MERCEDES UNCLASSIFIEDs show better MOT pass rates than older ones, with an average improvement of 13 percentage points.

Buying a Used 2021 MERCEDES UNCLASSIFIED

At 3 years old, this is still relatively fresh. You may find examples with remaining manufacturer warranty. Depreciation is slowing but hasn't bottomed out yet.

Alternatives to the 2021 MERCEDES UNCLASSIFIED

The MERCEDES UNCLASSIFIED is actually the most reliable option among similar diesel large cars from this era. Here are comparable diesel cars with similar engines: