Should I check the MOT history before buying a 1988 Mercedes Benz 420?

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 1988 Mercedes Benz 420?

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 1988 Mercedes Benz 420?

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.

How many 1988 Mercedes Benz 420 vehicles have had dangerous defects recorded?

22% of these vehicles have had a dangerous defect recorded. Search the registration on CarHunch — the full MOT history will show exactly what was flagged and whether it was resolved.

Is the 1988 Mercedes Benz 420 reliable?

Based on MOT data from 533 vehicles, the 1988 Mercedes Benz 420 has a first-time MOT pass rate of 73.5%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

What are common problems with the 1988 Mercedes Benz 420?

The most frequently recorded MOT issues on the 1988 Mercedes Benz 420 are: Oil leak (36.7% of vehicles), Oil leak, but not excessive (24.9% of vehicles), Offside Rear Tyre worn close to the legal limit (24.4% 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 1988 Mercedes Benz 420?

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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Mercedes Benz 420 (1988)

533 real MOT outcomes analysed • 73.5% first-time pass rate

1988 Mercedes Benz 420

CarHunch analysed 533 real MOT records for the 1988 Mercedes Benz 420. 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

The 1988 Mercedes Benz 420 has a below-average first-time pass rate (73.5% vs ~80% UK average) — check the specific vehicle's full MOT history carefully before buying.

⚠️ Over 1 in 5 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

73.5%

UK average ~80%

Below average

Dangerous (ever)

21.6%

At least once in MOT history

Check this vehicle

Avg failures / car

2.74

Over 11.1 tests on record

High

Typical mileage

116k

Middle half: 85k–151k

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 11.6 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 533 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 533 vehicles — figures show how many had each issue flagged at least once in their MOT history.

Other issues 36.7%

Oil leak · Oil leak, but not excessive

Tyre wear 24.4%

Offside Rear Tyre worn close to the legal limit · Nearside Rear Tyre worn close to the legal limit · Offside 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.

Exhaust & emissions 23.9%

Exhaust emissions carbon monoxide content excessive · Exhaust has a minor leak of exhaust gases

Brake wear 20.2%

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

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

Suspension & steering 16.6%

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.

Lighting 13.3%

Offside Headlamp aim too low · Nearside Headlamp aim too low

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

Data covers a 3-year window centred on 1988.

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 533 Mercedes Benz 420 cars.

Before you buy a 1988 Mercedes Benz 420

Based on MOT data from 533 vehicles — here's what to check.

📋 Check the full MOT history. 21.6% 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 (99%)	527	73.5%	2.76

Colour Breakdown

Based on 2,319 Mercedes Benz 420 vehicles registered in the UK — across all years. From DVLA registration records.

Blue 27.9%

646

Silver 17%

394

Red 14.3%

331

Black 13.3%

308

Grey 8.6%

199

White 6%

138

Green 5.6%

131

Gold 3.4%

Brown 2.7%

Cream 0.6%

Beige 0.4%

Bronze 0.3%

Mileage Distribution

Most 1988 Mercedes Benz 420 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.

116,123

typical

85,186

low mileage

151,447

high mileage

Half of all 1988 Mercedes Benz 420 vehicles fall between 85,186 and 151,447 miles.

Is the mileage you're seeing normal?

✓ Under 85,186 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.

✓ 85,186–151,447 miles — normal for age. This is where most 1988 Mercedes Benz 420s sit.

⚠ Over 204,453 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

1988 Mercedes Benz 420 — Still on the Road

Most 1988 Mercedes Benz 420s are still being driven.

146 vehicles still getting MOTs in 2025 — 70% of the peak remain.

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

11.1

Avg MOT tests per vehicle

2.74

Avg failures per vehicle

11.6

Avg advisories per vehicle

Other model years — Mercedes Benz 420: All 420 years → Which year to buy? →

1986 1987 1989 1990 1991

Or browse all models: Mercedes Benz →

Compare with another model

See how the 1988 Mercedes Benz 420 stacks up against a rival.

Buyer beware — pass it on