Audi 100 (1991)

Estimated running costs and MOT pass rates from 54 MOT tests in 2024.

Annual Cost

£2,738

£228/month

MOT Pass Rate

89%

Good

Road Tax

£375

Estimated/year

Est. Insurance

Grp 25-38

2309cc Petrol

Solid Option

89% pass rate, £2,738/year to run. 7 points above average.

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Petrol2309cc35 years old54 tests129k miles avg

Annual Running Costs

Fuel (Petrol, 2309cc)

~30 mpg

£1,958

Road Tax

Pre-2001 engine size rate

£375

MOT Test

£55

Predicted Repairs

£350

Total per year£2,738

Per month£228/mo

Per week£53/wk

Estimates based on 7,400 miles/year (UK average), petrol at 174.57p a litre (GOV.UK weekly average, week of 19 October 2026), GOV.UK road tax rates and repair likelihood from MOT data. Insurance not included.

Reliability Verdict

89% MOT pass rate(Good)

0%All-model avg: 82%100%

Good reliability. Occasional issues but generally solid. That's 7 points above the average of 82% across all models in our data.

89% of MOT tests on Audi 100s from 1991 ended in a pass in 2024, when they were about 33 years old. That's based on 54 tests across the UK, retests included. The average mileage recorded at those tests was 129,101 miles.

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How Does It Compare?

Rank among 1991 models39th of 172(top 23%)

Rank among Audi models758th of 1,066(bottom half)

vs average of all models+7%(82% avg)

vs 1991 models average+10%(79% avg)

vs Audi average-1%(90% avg)

Mileage Analysis

129,101

Average miles

244,200

Expected for age

The average 1991 Audi 100 had 129,101 miles on the clock at its 2024 MOT, which is below the expected 244,200 miles for a 33-year-old car. This suggests lighter use than average, which generally means less wear on major components.

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Audi 100 by Year

Year	Pass Rate	Tests	Avg Mileage
1994	77%	95	165,828 mi
1993	79%	43	167,094 mi
1992	92%	49	156,538 mi
1991	89%	54	129,101 mi
1990	83%	58	129,885 mi

Similar Cars to Consider

BMW 3 Series

1990 · 1990cc Petrol

£2,411/year

84%

-5%

Mercedes 190 E

1992 · 1997cc Petrol

£2,561/year

79%

-10%

Saab 900

1993 · 1985cc Petrol

£2,561/year

73%

-16%

Ford Escort

1993 · 1993cc Petrol

£2,411/year

83%

-6%

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About the 1991 Audi 100

The 1991 Audi 100 is a premium car. Our records list a 2309cc petrol engine, though engines vary between versions. 54 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. It ranks in the top 23% of all 1991 models for MOT pass rate.

With an average of 129,101 miles recorded at its 2024 MOT tests, Audi 100 owners tend to use this car less than the typical driver.

1991 Audi 100 Fuel Costs

The 2309cc petrol engine offers a reasonable balance between performance and economy. Expect around 30 mpg in mixed driving, which works out to roughly £1,958 per year with petrol at 174.57p per litre (GOV.UK weekly average, week of 19 October 2026; based on 7,400 miles per year).

What does it cost to own a 1991 Audi 100?

Total estimated annual running cost is £2,738 (£228/month), broken down as £1,958 fuel, £375 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 89% pass rate. Keeping on top of servicing will help avoid surprises.

Buying a Used 1991 Audi 100

At 35 years old, the Audi 100 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. Note: with only 54 tests in our data, these figures should be treated as indicative rather than definitive.

Common Issues to Watch For

These are typical issues for cars of this age, fuel type and engine size, not faults recorded on this model's MOT tests. Use them as a checklist when you view one.

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 129k 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.

Engine Mounts

Medium risk

Worn engine mounts cause excessive vibration and movement. Replacement costs £150-£400 per mount. Check for vibration at idle with the bonnet open.

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 Audi 100 stacks up against similar cars for estimated annual running costs, insurance group, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Est. Ins. Group	Total/yr
Audi 100(1991)	89%	£1,958	£375	Grp 25-38	£2,738
BMW 3 Series(1990)	84%	£1,631	£375	Grp 18-32	£2,411-£327
Mercedes 190 E(1992)	79%	£1,631	£375	Grp 18-32	£2,561-£177
Saab 900(1993)	73%	£1,631	£375	Grp 18-32	£2,561-£177
Ford Escort(1993)	83%	£1,631	£375	Grp 18-32	£2,411-£327

Estimates based on 7,400 miles/year, GOV.UK average pump prices for the week of 19 October 2026, GOV.UK road tax rates and MOT data. Insurance groups are our rough estimate from engine size, not official groups. Actual costs vary by driver, location, and usage.

Questions about the 1991 Audi 100

Is the 1991 Audi 100 reliable?

Good reliability. Occasional issues but generally solid. 89% of MOT tests on 1991 Audi 100s ended in a pass, from 54 tests (DVSA MOT data for tests in 2024, retests included). That's 7 points above the average of 82% across all models in the same data.

How much does a 1991 Audi 100 cost to run?

Our estimate is £2,738 a year (£228 a month): £1,958 fuel, £375 road tax, £55 MOT and £350 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 1991 Audi 100?

89% of 54 MOT tests on the 1991 Audi 100 ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 39th of 172 models first registered in 1991 (top 23%).

What is the average mileage for a 1991 Audi 100?

The average mileage recorded at MOT tests on the 1991 Audi 100 is 129,101 miles, which is below the expected 244,200 miles for a 33-year-old car. This suggests lighter use than average, which generally means less wear on major components.