Should I check the MOT history before buying a 2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A?

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 2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A?

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 2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A?

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 2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A vehicles have had dangerous defects recorded?

20% 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.

Do I need an HPI check when buying a 2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A?

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 Gls 400 Amg Ln Prem+exe D 4m A (2020)

Q: Is the 2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A reliable?

Based on MOT data from 103 vehicles, the 2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A has a first-time MOT pass rate of 88.6%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

103 real MOT outcomes analysed • 88.6% first-time pass rate

2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A

CarHunch analysed 103 real MOT records for the 2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A. 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 Check a Specific Reg Buyer's Checklist Mileage Distribution Still on the Road MOT Averages Compare Models

This Mercedes-Benz GLS 400 AMG diesel sits right at the UK average with a 79.2% first-time pass rate, so reliability is broadly in line with what you'd expect from any car on the road. However, 20.4% of vehicles in this cohort have recorded a dangerous defect at some point, which is notably high and worth taking seriously when inspecting a used example—check brakes, suspension and lights carefully.

At just under 38,000 miles median (4-year-old cars), these are lightly used examples, which explains the low failure rate of 0.46 per vehicle, though the 1.9 advisories per car suggest routine wear and maintenance costs are creeping in. Before buying, request the full MOT history and have a pre-purchase inspection focus on the cooling system and transmission—common advisory areas on this model—to avoid expensive repairs down the line.

We have limited data for the 2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A — treat the figures below as indicative rather than definitive.

⚠️ 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

88.6%

UK average ~80%

Better than average

Dangerous (ever)

20.4%

At least once in MOT history

Check this vehicle

Avg failures / car

0.46

Over 3.3 tests on record

Low

Typical mileage

38k

Middle half: 28k–51k

For context

These stats describe 103 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.

Average reliability — agree?

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 103 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A cars.

Before you buy a 2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A

Based on MOT data from 103 vehicles — here's what to check.

📋 Check the full MOT history. 20.4% 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

Mileage Distribution

Most 2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A 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.

37,947

typical

28,190

low mileage

51,476

high mileage

Half of all 2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A vehicles fall between 28,190 and 51,476 miles.

Is the mileage you're seeing normal?

✓ Under 28,190 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.

✓ 28,190–51,476 miles — normal for age. This is where most 2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m As sit.

⚠ Over 69,492 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A — Still on the Road

Almost all 2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m As are still on the road.

Strong survival — 85 vehicles still getting MOTs in 2025, 96% of the peak.

Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2023–2025.

MOT History Averages

3.3

Avg MOT tests per vehicle

0.46

Avg failures per vehicle

1.9

Avg advisories per vehicle

Compare with another model

See how the 2020 Mercedes Benz Gls 400 Amg Ln Prem+exe D 4m A stacks up against a rival.

Average reliability — agree?