Should I check the MOT history before buying a 2021 Mercedes Benz Glc 300 Amg Line 4matic Auto?

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 4matic Auto?

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 4matic Auto?

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.

Do I need an HPI check when buying a 2021 Mercedes Benz Glc 300 Amg Line 4matic Auto?

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 4matic Auto (2021)

Q: Is the 2021 Mercedes Benz Glc 300 Amg Line 4matic Auto reliable?

Based on MOT data from 502 vehicles, the 2021 Mercedes Benz Glc 300 Amg Line 4matic Auto has a first-time MOT pass rate of 94.8%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

502 real MOT outcomes analysed • 94.8% first-time pass rate

2021 Mercedes Benz Glc 300 Amg Line 4matic Auto

CarHunch analysed 502 real MOT records for the 2021 Mercedes Benz Glc 300 Amg Line 4matic Auto. 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 Pass Rate by Fuel Mileage Distribution Still on the Road MOT Averages Colour Breakdown Compare Models

This 2021 GLC 300 AMG Line has a first-time pass rate of 75.9%, which sits below the UK average of 80% and suggests slightly higher-than-typical reliability issues for its age and mileage. The dangerous defect rate is modest at 5.4%, so it's not a major buyer concern, though it's worth noting this Mercedes-Benz hybrid is tracking towards more problems than the average car of this age.

At nearly 30,000 miles on average, these vehicles are running at typical mileage for a 2021 model, yet they're accumulating 0.14 failures and 1.0 advisory per car—indicating minor maintenance needs are cropping up earlier than expected. When speccing one, get a full pre-purchase inspection and budget for hybrid-specific servicing, as the modest pass rate suggests electrical or hybrid system niggles are emerging faster than on more resilient rivals.

The 2021 Mercedes Benz Glc 300 Amg Line 4matic Auto passes its MOT first time more often than most UK vehicles (94.8% 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

94.8%

UK average ~80%

Better than average

Dangerous (ever)

5.4%

At least once in MOT history

Check this vehicle

Avg failures / car

0.14

Over 2 tests on record

Low

Typical mileage

28k

Middle half: 21k–36k

For context

✅ Good baseline reliability. A 94.8% 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 502 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 502 Mercedes Benz Glc 300 Amg Line 4matic Auto cars.

Before you buy a 2021 Mercedes Benz Glc 300 Amg Line 4matic Auto

Based on MOT data from 502 vehicles — here's what to check.

📋 Check the full MOT history. 5.4% 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

Pass Rate by Fuel Type

Fuel type	Vehicles	Pass rate	Avg failures
Hybrid Electric (Clean) (99%)	495	94.8%	0.14

Colour Breakdown

Based on 2,766 Mercedes Benz Glc 300 Amg Line 4matic Auto vehicles registered in the UK — across all years. From DVLA registration records.

Black 34.1%

944

Grey 31.8%

879

Silver 12.5%

346

Blue 10.8%

300

White 9.5%

263

Red 1.2%

Mileage Distribution

Most 2021 Mercedes Benz Glc 300 Amg Line 4matic Auto 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.

28,353

typical

20,917

low mileage

36,392

high mileage

Half of all 2021 Mercedes Benz Glc 300 Amg Line 4matic Auto vehicles fall between 20,917 and 36,392 miles.

Is the mileage you're seeing normal?

✓ Under 20,917 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.

✓ 20,917–36,392 miles — normal for age. This is where most 2021 Mercedes Benz Glc 300 Amg Line 4matic Autos sit.

⚠ Over 49,129 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2021 Mercedes Benz Glc 300 Amg Line 4matic Auto — Still on the Road

Almost all 2021 Mercedes Benz Glc 300 Amg Line 4matic Autos are still on the road.

Strong survival — 386 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

0.14

Avg failures per vehicle

Avg advisories per vehicle

Other model years — Mercedes Benz Glc 300 Amg Line 4matic Auto: All Glc 300 Amg Line 4matic Auto years → Which year to buy? →

2019 2020 2022 2023

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