Should I check the MOT history before buying a 2021 Mercedes Benz Glc 300 Amg Line Prem + 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 2021 Mercedes Benz Glc 300 Amg Line Prem + 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 2021 Mercedes Benz Glc 300 Amg Line Prem + 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.

Is the 2021 Mercedes Benz Glc 300 Amg Line Prem + D 4m A reliable?

Based on MOT data from 950 vehicles, the 2021 Mercedes Benz Glc 300 Amg Line Prem + D 4m A has a first-time MOT pass rate of 93.7%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

Do I need an HPI check when buying a 2021 Mercedes Benz Glc 300 Amg Line Prem + 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 Glc 300 Amg Line Prem + D 4m A (2021)

950 real MOT outcomes analysed • 93.7% first-time pass rate

2021 Mercedes Benz Glc 300 Amg Line Prem + D 4m A

CarHunch analysed 950 real MOT records for the 2021 Mercedes Benz Glc 300 Amg Line Prem + 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 MOT Averages Colour Breakdown Compare Models

The 2021 Mercedes-Benz GLC 300 AMG Line is a strong performer in the MOT bay, with a 91.8% first-time pass rate that comfortably beats the UK average of 80%—a real mark of reliability at this age. Only 8.3% of vehicles have ever recorded a dangerous defect, which is well below concern threshold and suggests these cars are safe bets structurally.

At 31,150 miles median (33,612 average), these vehicles are running light for their age, which partly explains the clean record. The typical car racks up just 0.2 failures and 1.6 advisories per test, pointing to predictable wear items rather than systemic weak spots—the takeaway is that you're buying a well-engineered diesel SUV where maintenance trumps luck.

The 2021 Mercedes Benz Glc 300 Amg Line Prem + D 4m A passes its MOT first time more often than most UK vehicles (93.7% vs ~80% average) — and when it does fail, it's usually something minor and cheap to fix.

⚠️ About 1 in 12 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

93.7%

UK average ~80%

Better than average

Dangerous (ever)

8.3%

At least once in MOT history

Check this vehicle

Avg failures / car

0.2

Over 2.3 tests on record

Low

Typical mileage

31k

Middle half: 25k–40k

For context

✅ Good baseline reliability. A 93.7% first-time pass rate puts this well above the UK average — it's a well-sorted vehicle in this age bracket.

🔧 Expect consumable spend. An average of 1.6 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 950 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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See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 950 Mercedes Benz Glc 300 Amg Line Prem + D 4m A cars.

Before you buy a 2021 Mercedes Benz Glc 300 Amg Line Prem + D 4m A

Based on MOT data from 950 vehicles — here's what to check.

📋 Check the full MOT history. 8.3% 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

Colour Breakdown

Based on 4,437 Mercedes Benz Glc 300 Amg Line Prem + D 4m A vehicles registered in the UK — across all years. From DVLA registration records.

Black 44.6%

1,979

Grey 20.2%

897

Silver 13.7%

608

Blue 10.6%

471

White 9.3%

411

Red 1.6%

Mileage Distribution

Most 2021 Mercedes Benz Glc 300 Amg Line Prem + 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.

31,150

typical

24,616

low mileage

40,290

high mileage

Half of all 2021 Mercedes Benz Glc 300 Amg Line Prem + D 4m A vehicles fall between 24,616 and 40,290 miles.

Is the mileage you're seeing normal?

✓ Under 24,616 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.

✓ 24,616–40,290 miles — normal for age. This is where most 2021 Mercedes Benz Glc 300 Amg Line Prem + D 4m As sit.

⚠ Over 54,391 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

MOT History Averages

2.3

Avg MOT tests per vehicle

0.2

Avg failures per vehicle

1.6

Avg advisories per vehicle

Other model years — Mercedes Benz Glc 300 Amg Line Prem + D 4m A: All Glc 300 Amg Line Prem + D 4m A years → Which year to buy? →

2019 2020 2022 2023

Or browse all models: Mercedes Benz →

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