Should I check the MOT history before buying a 2020 Mercedes Benz G?

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 G?

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 G?

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 2020 Mercedes Benz G reliable?

Based on MOT data from 425 vehicles, the 2020 Mercedes Benz G has a first-time MOT pass rate of 94.2%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

What are common problems with the 2020 Mercedes Benz G?

The most frequently recorded MOT issues on the 2020 Mercedes Benz G are: Nearside Front Tyre worn close to legal limit/worn on edge (24.3% of vehicles), Offside Front Tyre worn close to legal limit/worn on edge (20.5% of vehicles), Rear Brake pad(s) wearing thin (14% 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 2020 Mercedes Benz G?

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 G (2020)

425 real MOT outcomes analysed • 94.2% first-time pass rate

2020 Mercedes Benz G

CarHunch analysed 425 real MOT records for the 2020 Mercedes Benz G. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
Which year to buy? →

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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

Moderate sample. 425 vehicles on record. Figures are indicative — the specific vehicle's history matters more than these averages.

The 2020 Mercedes-Benz G is a notably reliable proposition, with a 94.0% first-time pass rate that sits well clear of the UK average of 80%—both petrol and diesel versions perform consistently, at 94.3% and 93.1% respectively. The dangerous defect rate of 6.8% is low enough not to be a serious concern for buyers.

At just under 32,000 miles on average, these cars are still relatively young with modest mileage, which explains why they average only 0.24 failures per test. The 1.3 advisories per vehicle suggest minor wear items rather than structural problems, so when you're evaluating a used example, focus your pre-purchase inspection on service history and brake condition (a common advisory area for this age group) rather than expecting major issues.

The 2020 Mercedes Benz G passes its MOT first time more often than most UK vehicles (94.2% vs ~80% average) — and when it does fail, it's usually something minor and cheap to fix.

⚠️ Around 1 in 20 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

94.2%

UK average ~80%

Better than average

Dangerous (ever)

6.8%

At least once in MOT history

Check this vehicle

Avg failures / car

0.24

Over 3 tests on record

Low

Typical mileage

27k

Middle half: 19k–38k

For context

✅ Good baseline reliability. A 94.2% first-time pass rate puts this well above the UK average — it's a well-sorted vehicle in this age bracket.

🔍 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 425 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.

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What tends to go wrong

Across 425 vehicles — figures show how many had each issue flagged at least once in their MOT history.

Tyre wear 24.3%

Nearside Front Tyre worn close to legal limit/worn on edge · Offside Front Tyre worn close to legal limit/worn on edge · Offside Rear Tyre worn close to legal limit/worn on edge · …

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

Brake wear 14%

Rear Brake pad(s) wearing thin · Front Brake pad(s) wearing thin

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

Other issues 5.6%

Nearside Rear Child Seat fitted not allowing full inspection of adult belt · Windscreen damaged but not adversely affecting driver's view · Front Registration plate does not conform to the specified requirements · …

Data covers a 3-year window centred on 2020.

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 425 Mercedes Benz G cars.

Before you buy a 2020 Mercedes Benz G

Based on MOT data from 425 vehicles — here's what to check.

📋 Check the full MOT history. 6.8% 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 (70%)	296	94.7%	0.22
Diesel (30%)	128	93.1%	0.27

Colour Breakdown

Based on 1,708 Mercedes Benz G vehicles registered in the UK — across all years. From DVLA registration records.

Black 60.7%

1,037

Grey 12.7%

217

Green 6.9%

117

Silver 6.6%

113

Blue 6%

103

White 5.2%

Red 1.5%

Brown 0.4%

Mileage Distribution

Most 2020 Mercedes Benz G 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.

26,851

typical

18,994

low mileage

37,541

high mileage

Half of all 2020 Mercedes Benz G vehicles fall between 18,994 and 37,541 miles.

Is the mileage you're seeing normal?

✓ Under 18,994 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.

✓ 18,994–37,541 miles — normal for age. This is where most 2020 Mercedes Benz Gs sit.

⚠ Over 50,680 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 G — Still on the Road

Almost all 2020 Mercedes Benz Gs are still on the road.

Strong survival — 378 vehicles still getting MOTs in 2025, 100% 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

Avg MOT tests per vehicle

0.24

Avg failures per vehicle

1.3

Avg advisories per vehicle

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

2019 2021 2022

Or browse all models: Mercedes Benz →

Compare with another model

See how the 2020 Mercedes Benz G stacks up against a rival.

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