How much does a 2021 MERCEDES UNCLASSIFIED cost to run?

Estimated annual running cost is £1,695 (£141/month), including £1245 fuel, £195 road tax, £55 MOT, and £200 predicted repairs.

What is the MOT pass rate for a 2021 MERCEDES UNCLASSIFIED?

The 2021 MERCEDES UNCLASSIFIED has a 96% MOT pass rate based on 270 tests in 2026. This ranks 599 out of 3373 cars from 2021.

Which year MERCEDES UNCLASSIFIED is most reliable?

The 2021 MERCEDES UNCLASSIFIED has the highest MOT pass rate at 96%. The least reliable year is 1997 at 66%.

MERCEDES UNCLASSIFIED (2021)

Q: Is the 2021 MERCEDES UNCLASSIFIED reliable?

Excellent reliability. Very few MOT failures. 96% of MERCEDES UNCLASSIFIEDs from 2021 passed their MOT first time in 2026, based on 270 tests. That's 14 points above the national average of 82%.

Q: What is the average mileage for a 2021 MERCEDES UNCLASSIFIED?

The average mileage for a 2021 MERCEDES UNCLASSIFIED is 14,108 miles, which is significantly below the expected 37,000 miles for a 5-year-old car. Low-mileage examples may have spent time sitting unused, so check for issues like corroded brakes or perished rubber seals.

Running costs, reliability data, and common problems from 270 real MOT tests.

Annual Cost

£1,695

£141/month

MOT Pass Rate

96%

Excellent

Road Tax

£195

Flat rate/year

Insurance

Grp 30-42

2987cc Diesel

Great Choice

96% pass rate, £1695/year to run. 14 points above average.

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Diesel2987cc5 years old270 tests14k miles avg

Annual Running Costs

Fuel (Diesel, 2987cc)

~40 mpg

£1,245

Road Tax

Flat rate (post-2017)

£195

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£1,695

Per month£141/mo

Per week£33/wk

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

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Reliability Verdict

96% MOT pass rate(Excellent)

0%National avg: 82%100%

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 5 years old, 96% of MERCEDES UNCLASSIFIEDs from 2021 passed their MOT first time in 2026. That's based on 270 tests across the UK. The average mileage at this age is 14,108 miles.

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How Does It Compare?

Rank among 2021 cars599th of 3,373(top 18%)

Rank among MERCEDES models174th 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

14,108

Average miles

37,000

Expected for age

The average 2021 MERCEDES UNCLASSIFIED has 14,108 miles on the clock, which is significantly below the expected 37,000 miles for a 5-year-old car. Low-mileage examples may have spent time sitting unused, so check for issues like corroded brakes or perished rubber seals.

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MERCEDES UNCLASSIFIED by Year

Year	Pass Rate	Tests	Avg Mileage
2021	96%	270	14,108 mi
2020	93%	237	17,059 mi
2019	95%	176	25,080 mi
2018	92%	202	40,291 mi
2017	91%	200	39,620 mi
2016	87%	326	45,907 mi
2015	91%	252	72,531 mi
2014	86%	289	83,046 mi
2013	89%	245	52,132 mi
2012	89%	185	66,863 mi
2011	90%	126	63,066 mi
2010	92%	98	94,655 mi
2009	79%	174	100,957 mi
2008	79%	354	111,482 mi
2007	81%	259	105,351 mi
2006	81%	240	95,112 mi
2005	79%	273	101,492 mi
2004	79%	298	91,119 mi
2003	73%	178	102,840 mi
2002	84%	214	129,941 mi
2001	73%	107	121,123 mi
2000	73%	195	116,472 mi
1999	78%	223	144,511 mi
1998	81%	155	139,571 mi
1997	66%	65	104,116 mi
1996	66%	101	175,170 mi
1995	78%	45	212,804 mi
1994	74%	86	85,110 mi
1993	89%	47	159,142 mi
1992	60%	40	117,020 mi
1991	73%	33	102,932 mi
1990	83%	58	95,507 mi

Similar Cars to Consider

MERCEDES E

2019 · 2925cc Diesel

£1,690/year

90%

-6%

FORD RANGER

2019 · 3198cc Diesel

£1,840/year

87%

-9%

AUDI Q5

2019 · 2967cc Diesel

£1,690/year

93%

-3%

AUDI A5

2019 · 2967cc Diesel

£1,690/year

90%

-6%

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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 2026, 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 5 years old, MERCEDES UNCLASSIFIED owners tend to use this car less than the typical driver. Very low mileage could mean the car has been garaged or used only for short trips, which can cause its own issues like battery drain and moisture buildup.

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). 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 2021 MERCEDES UNCLASSIFIED?

Total estimated annual running cost is £1,695 (£141/month), broken down as £1245 fuel, £195 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 5 years old, the MERCEDES UNCLASSIFIED offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost.

Common Issues to Watch For

Based on the 2021 MERCEDES UNCLASSIFIED's fuel type, age, and engine size, these are the most likely problem areas to check.

DPF (Diesel Particulate Filter)

Watch out

Short journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.

Turbo Wear

Medium risk

Diesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.

AdBlue System

Medium risk

Post-2015 diesels use AdBlue for emissions. Sensor failures and tank heater issues are common. Budget £200-£500 for repairs.

EGR Valve

Low risk

Exhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.

Dual Mass Flywheel

Medium risk

Larger diesel engines put extra strain on the dual mass flywheel. Listen for rattling at idle. Replacement with clutch is £800-£1,500.

Service History

Low risk

Always request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.

Running Costs Compared

How the 2021 MERCEDES UNCLASSIFIED stacks up against similar cars for annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
MERCEDES UNCLASSIFIED(2021)	96%	£1245	£195	Grp 30-42	£1695
MERCEDES E(2019)	90%	£1245	£190	Grp 30-42	£1690-£5
FORD RANGER(2019)	87%	£1245	£190	Grp 35-50	£1840+£145
AUDI Q5(2019)	93%	£1245	£190	Grp 30-42	£1690-£5
AUDI A5(2019)	90%	£1245	£190	Grp 30-42	£1690-£5

Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.