How much does a 1991 MERCEDES C cost to run?

Estimated annual running cost is £2,577 (£215/month), including £1592 fuel, £430 road tax, £55 MOT, and £500 predicted repairs.

What is the MOT pass rate for a 1991 MERCEDES C?

The 1991 MERCEDES C has a 79% MOT pass rate based on 47 tests in 2026. This ranks 94 out of 179 cars from 1991.

Which year MERCEDES C is most reliable?

The 2020 MERCEDES C has the highest MOT pass rate at 92%. The least reliable year is 2004 at 72%.

MERCEDES C (1991)

Q: Is the 1991 MERCEDES C reliable?

Average reliability. Expect some repairs as it ages. 79% of MERCEDES Cs from 1991 passed their MOT first time in 2026, based on 47 tests. That's 3 points below the national average of 82%.

Q: What is the average mileage for a 1991 MERCEDES C?

The average mileage for a 1991 MERCEDES C is 112,139 miles, which is significantly below the expected 259,000 miles for a 35-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 47 real MOT tests.

Annual Cost

£2,577

£215/month

MOT Pass Rate

79%

Average

Road Tax

£430

Based on CC/year

Insurance

Grp 25-38

2299cc Petrol

Check Carefully

79% pass rate, £2577/year to run. Close to the national average.

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Petrol2299cc35 years old47 tests112k miles avg

Annual Running Costs

Fuel (Petrol, 2299cc)

~30 mpg

£1,592

Road Tax

Based on 2299cc

£430

MOT Test

£55

Predicted Repairs

£500

Total per year£2,577

Per month£215/mo

Per week£50/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

79% MOT pass rate(Average)

0%National avg: 82%100%

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 35 years old, 79% of MERCEDES Cs from 1991 passed their MOT first time in 2026. That's based on 47 tests across the UK. The average mileage at this age is 112,139 miles.

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How Does It Compare?

Rank among 1991 cars94th of 179(top 53%)

Rank among MERCEDES models1139th of 1,408(top 81%)

vs national average-3%(82% avg)

vs 1991 cars average+1%(78% avg)

vs MERCEDES average-8%(87% avg)

Mileage Analysis

112,139

Average miles

259,000

Expected for age

The average 1991 MERCEDES C has 112,139 miles on the clock, which is significantly below the expected 259,000 miles for a 35-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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Best Year to Buy?

The most reliable year is the 2020 model with a 92% MOT pass rate, while the 2004 model has the lowest at 72%. The 1991 sits between the two at 79%.

MERCEDES C by Year

Year	Pass Rate	Tests	Avg Mileage
2021	92%	3,772	27,184 mi
2020	92%	16,225	33,734 mi
2019	91%	52,838	40,700 mi
2018	90%	62,138	51,166 mi
2017	89%	87,612	60,957 mi
2016	88%	80,181	73,695 mi
2015	86%	71,635	85,216 mi
2014	85%	54,729	90,129 mi
2013	81%	51,703	97,102 mi
2012	79%	59,235	102,461 mi
2011	79%	42,676	109,800 mi
2010	78%	28,538	111,322 mi
2009	77%	28,440	118,861 mi
2008	77%	30,369	121,672 mi
2007	76%	25,544	119,028 mi
2006	74%	20,205	118,301 mi
2005	73%	17,978	121,824 mi
2004	72%	13,493	116,683 mi
2003	73%	9,158	112,103 mi
2002	75%	4,985	103,944 mi
2001	75%	2,463	101,994 mi
2000	77%	1,103	104,741 mi
1999	82%	2,683	110,180 mi
1998	79%	2,916	112,877 mi
1997	81%	2,336	121,767 mi
1996	82%	1,296	107,809 mi
1995	83%	1,017	101,913 mi
1994	84%	735	103,968 mi
1993	82%	71	105,975 mi
1992	87%	30	131,044 mi
1991	79%	47	112,139 mi
1990	66%	41	103,332 mi

Similar Cars to Consider

BMW 3 SERIES

1990 · 1990cc Petrol

£1,867/year

84%

+5%

MERCEDES 190 E

1992 · 1997cc Petrol

£2,017/year

79%

same

SAAB 900

1993 · 1985cc Petrol

£2,017/year

73%

-6%

FORD ESCORT

1993 · 1993cc Petrol

£1,867/year

83%

+4%

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About the 1991 MERCEDES C

The 1991 MERCEDES C is a large car with a 2299cc petrol engine. 47 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. Among all cars from 1991, the average MOT pass rate is 78%, and this model beats that benchmark.

With an average of 112,139 miles at 35 years old, MERCEDES C 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.

1991 MERCEDES C Fuel Costs

The 2299cc petrol engine offers a reasonable balance between performance and economy. Expect around 30 mpg in mixed driving, which works out to roughly £1,592 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).

What does it cost to own a 1991 MERCEDES C?

Total estimated annual running cost is £2,577 (£215/month), broken down as £1592 fuel, £430 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 C Reliability Trend

Newer MERCEDES Cs show better MOT pass rates than older ones, with an average improvement of 6 percentage points.

Buying a Used 1991 MERCEDES C

At 35 years old, the MERCEDES C is firmly in budget territory. Purchase prices are low, but check for rust, worn suspension bushes, and electrical gremlins. A full service history is especially valuable at this age. If you're flexible on year, the 2020 model has the highest pass rate at 92%. Note: with only 47 tests in our data, these figures should be treated as indicative rather than definitive.

Common Issues to Watch For

Based on the 1991 MERCEDES C's fuel type, age, and engine size, these are the most likely problem areas to check.

Timing Chain / Belt

Watch out

At 35 years old, check whether the timing belt has been replaced (typically due every 5-7 years or 60,000-100,000 miles). A snapped belt can destroy the engine.

Oil Consumption

Medium risk

Larger petrol engines can develop higher oil consumption as they age. Check the oil level and look for blue smoke from the exhaust.

Rust and Corrosion

Watch out

At 10+ years, check wheel arches, sills, subframe, and brake lines for rust. Structural corrosion is an MOT failure. Prevention is far cheaper than repair.

Suspension Bushings

Watch out

Rubber suspension bushes harden and crack with age, causing knocking noises and vague handling. A full refresh costs £300-£800 depending on the car.

Clutch Wear

Watch out

With an average of 112k miles, clutch replacement may be due (typical lifespan 60,000-100,000 miles). Budget £400-£800 for a new clutch kit.

Brake Discs and Pads

Medium risk

High-mileage cars often need brake disc replacement, not just pads. A full set of discs and pads costs £200-£500 per axle.

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 1991 MERCEDES C stacks up against similar cars for annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
MERCEDES C(1991)	79%	£1592	£430	Grp 25-38	£2577
BMW 3 SERIES(1990)	84%	£1327	£135	Grp 18-32	£1867-£710
MERCEDES 190 E(1992)	79%	£1327	£135	Grp 18-32	£2017-£560
SAAB 900(1993)	73%	£1327	£135	Grp 18-32	£2017-£560
FORD ESCORT(1993)	83%	£1327	£135	Grp 18-32	£1867-£710

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.