Should I check the MOT history before buying a 1991 BMW 520?

Yes. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. A full MOT history analysis will highlight patterns that a single test result won't reveal.

What corrosion should I look for when inspecting a 1991 BMW 520?

Check brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that is expensive to fix and can fail an MOT.

How are tyres and brakes typically on a 1991 BMW 520?

Tyres and brakes are the most common advisory items on vehicles of this age. Budget for replacement if they are near the limit, and factor this into your offer price.

Is the 1991 BMW 520 reliable?

Based on MOT data from 1,725 vehicles, the 1991 BMW 520 has a first-time MOT pass rate of 68.6%, indicating average reliability for its class. Always check the full MOT history of any specific vehicle before buying.

What are common problems with the 1991 BMW 520?

The most frequently recorded MOT issues on the 1991 BMW 520 are: Fuel pipe/s corroded (34.4% of vehicles), Oil leak (25.5% of vehicles), Offside Rear Tyre worn close to the legal limit (23.9% of vehicles). These figures are based on actual MOT test records — search a specific registration on CarHunch to see its individual history.

Do I need an HPI check when buying a 1991 BMW 520?

Yes. The MOT history will not show outstanding finance, insurance write-offs, or stolen status. An HPI check covers these areas and should be part of any used car purchase.

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BMW 520 (1991)

1,725 real MOT outcomes analysed • 68.6% first-time pass rate

1991 BMW 520

CarHunch analysed 1,725 real MOT records for the 1991 BMW 520. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
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AI Analysis Reliability Overview Common Issues Check a Specific Reg Buyer's Checklist Pass Rate by Fuel Mileage Distribution Still on the Road MOT Averages Colour Breakdown Compare Models

This 1991 BMW 520 is notably unreliable by modern standards, with a first-time pass rate of just 68.6%—a full 11.4 percentage points below the UK average of 80%. While the dangerous defect rate of 13.9% isn't alarming, nearly seven in ten of these cars need remedial work before they'll pass their MOT, signalling serious wear on a 33-year-old model.

The median mileage of 142,436 is reasonable for the age, but the average of 1.59 failures per vehicle reveals widespread mechanical problems beyond simple wear items. With an average of 5.8 advisories flagged per test, these cars demand a pre-purchase inspection by a BMW specialist, particularly one familiar with 1990s fuel injection and cooling systems—don't rely on roadside checks alone.

The 1991 BMW 520 has a below-average first-time pass rate (68.6% vs ~80% UK average) — check the specific vehicle's full MOT history carefully before buying.

⚠️ Around 1 in 8 of these vehicles have had a dangerous MOT failure at some point — usually tyres or brakes, and often a one-off issue rather than a persistent problem. The group stats won't tell you which one you're looking at.

First-time pass

68.6%

UK average ~80%

Below average

Dangerous (ever)

13.9%

At least once in MOT history

Check this vehicle

Avg failures / car

1.59

Over 4.8 tests on record

High

Typical mileage

142k

Middle half: 114k–170k

For context

⚠️ Below average. More vehicles in this cohort fail their first MOT than typical. Scrutinise this vehicle's history — look for recurring issues, not just the latest result.

🔧 Expect consumable spend. An average of 5.8 advisories per vehicle tells you wear items (tyres, brakes) get flagged regularly. Budget for them — they're not surprises.

🔍 The dangerous defect figure is real. Most are one-off tyre failures or brake issues — not structural problems. But it's exactly why checking the individual vehicle's history is essential, not optional.

These stats describe 1,725 vehicles as a group. The specific vehicle you're looking at could be the one good example or the one outlier. Run its registration to find out.

Buyer beware — pass it on

What tends to go wrong

Across 1,725 vehicles — figures show how many had each issue flagged at least once in their MOT history.

Other issues 34.4%

Fuel pipe/s corroded · Oil leak

Tyre wear 23.9%

Offside Rear Tyre worn close to the legal limit · Nearside Rear Tyre worn close to the legal limit · Nearside Front Tyre worn close to the legal limit · …

Budget for a full set — on a vehicle this age, tyres are expected consumables. An inspection will confirm how much is left.

Brake wear 17.7%

Parking brake: efficiency below requirements · Offside Rear Brake pipe slightly corroded · Nearside Rear Brake pipe slightly corroded · …

Ask the seller when brakes were last serviced. If they don't know, factor in the cost.

Suspension & steering 14.4%

Steering system has slight free play detected at steering wheel

Harder to spot without a ramp — this is a good reason to book a pre-purchase inspection.

Exhaust & emissions 12.2%

Exhaust has a minor leak of exhaust gases

Lighting 9.6%

Exhaust has part of the system slightly deteriorated

Usually cheap to fix. Worth confirming all lights work before collecting.

Data covers a 3-year window centred on 1991.

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 1,725 BMW 520 cars.

Before you buy a 1991 BMW 520

Based on MOT data from 1,725 vehicles — here's what to check.

📋 Check the full MOT history. 13.9% of these vehicles have had a dangerous defect recorded - recurring advisories often signal problems years before they become failures.
Search the reg on CarHunch for the full MOT history, reliability stats and a free AI-powered analysis of that exact vehicle.
🔍 Brake pipes, sills and subframes are the key areas on a vehicle this age — structural rust is hard to spot without getting underneath. A mechanic will check all of this before you commit, and give you a concrete basis to negotiate on price. Inspection →
📄 Outstanding finance, insurance write-offs and clocking won't appear in the MOT records — a dedicated history check covers all of this. Our link gets you 20% off automatically. History Get 20% off via CarHunch

Pass Rate by Fuel Type

Fuel type	Vehicles	Pass rate	Avg failures
Petrol (100%)	1,720	68.6%	1.59

Colour Breakdown

Based on 153,915 BMW 520 vehicles registered in the UK — across all years. From DVLA registration records.

Black 25.6%

39,331

Grey 21.6%

33,230

Blue 16.8%

25,839

Silver 15.7%

24,148

White 11%

16,857

Green 4.1%

6,315

Red 3.5%

5,369

Brown 0.6%

966

Bronze 0.5%

725

Gold 0.4%

549

Beige 0.2%

357

Purple 0.1%

229

Mileage Distribution

Most 1991 BMW 520 vehicles sit in the blue band. If the vehicle you're looking at is outside it, it's either unusually low or high mileage for its age.

142,436

typical

113,817

low mileage

170,336

high mileage

Half of all 1991 BMW 520 vehicles fall between 113,817 and 170,336 miles.

Is the mileage you're seeing normal?

✓ Under 113,817 miles — lower than most. Could be great, or could be a vehicle that rarely moved. Check test frequency and mileage progression in the MOT history.

✓ 113,817–170,336 miles — normal for age. This is where most 1991 BMW 520s sit.

⚠ Over 229,953 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

1991 BMW 520 — Still on the Road

Numbers are thinning — 16% of 1991 BMW 520s are still active.

Numbers are declining — 15 vehicles still getting MOTs in 2025 (16% of peak).

Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2014–2025.
* The 2020 dip reflects the government's COVID-19 MOT exemption, which allowed certificates to be extended by six months — fewer tests were conducted that year.

MOT History Averages

4.8

Avg MOT tests per vehicle

1.59

Avg failures per vehicle

5.8

Avg advisories per vehicle

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Buyer beware — pass it on