Should I check the MOT history before buying a 2020 Mercedes Benz C 300 Amg Line Ed Prem D 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 C 300 Amg Line Ed Prem D 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 C 300 Amg Line Ed Prem D 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 2020 Mercedes Benz C 300 Amg Line Ed Prem D A reliable?

Based on MOT data from 604 vehicles, the 2020 Mercedes Benz C 300 Amg Line Ed Prem D A has a first-time MOT pass rate of 91.4%, 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 2020 Mercedes Benz C 300 Amg Line Ed Prem D 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 C 300 Amg Line Ed Prem D A (2020)

604 real MOT outcomes analysed • 91.4% first-time pass rate

2020 Mercedes Benz C 300 Amg Line Ed Prem D A

CarHunch analysed 604 real MOT records for the 2020 Mercedes Benz C 300 Amg Line Ed Prem D 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 Colour Breakdown Compare Models

This 2020 C 300 is a solid performer on the MOT bench: its 87.9% first-time pass rate beats the UK average of 80%, and only 17.7% of vehicles have ever recorded a dangerous defect, which is reassuringly below the concerning threshold. The diesel variant clearly suits Mercedes' engineering, as these cars are holding up well to early testing.

With a median mileage of 36,464 miles for a four-year-old car, these are typically well-driven rather than thrashed examples, and the 0.37 average failures per vehicle suggests owners aren't facing serious structural problems. However, the 2.8 advisories per car indicate minor wear items—expect to budget for brake pads, fluid top-ups, and suspension tweaks—so have a pre-purchase inspection focus on the suspension and cooling system before committing.

The 2020 Mercedes Benz C 300 Amg Line Ed Prem D A passes its MOT first time at roughly the UK average rate (91.4%) — solid but worth checking this vehicle's history carefully.

⚠️ Around 1 in 8 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

91.4%

UK average ~80%

Better than average

Dangerous (ever)

17.7%

At least once in MOT history

Check this vehicle

Avg failures / car

0.37

Over 3.3 tests on record

Low

Typical mileage

36k

Middle half: 27k–47k

For context

✅ Good baseline reliability. A 91.4% 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 2.8 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 604 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 604 Mercedes Benz C 300 Amg Line Ed Prem D A cars.

Before you buy a 2020 Mercedes Benz C 300 Amg Line Ed Prem D A

Based on MOT data from 604 vehicles — here's what to check.

📋 Check the full MOT history. 17.7% 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 841 Mercedes Benz C 300 Amg Line Ed Prem D A vehicles registered in the UK — across all years. From DVLA registration records.

Blue 28.2%

237

Grey 24.7%

208

Black 17%

143

Red 11.5%

Silver 10.9%

White 7.6%

Mileage Distribution

Most 2020 Mercedes Benz C 300 Amg Line Ed Prem D 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.

36,464

typical

26,686

low mileage

47,166

high mileage

Half of all 2020 Mercedes Benz C 300 Amg Line Ed Prem D A vehicles fall between 26,686 and 47,166 miles.

Is the mileage you're seeing normal?

✓ Under 26,686 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.

✓ 26,686–47,166 miles — normal for age. This is where most 2020 Mercedes Benz C 300 Amg Line Ed Prem D As sit.

⚠ Over 63,674 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 C 300 Amg Line Ed Prem D A — Still on the Road

Almost all 2020 Mercedes Benz C 300 Amg Line Ed Prem D As are still on the road.

Strong survival — 518 vehicles still getting MOTs in 2025, 94% of the peak.

Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2022–2025.

MOT History Averages

3.3

Avg MOT tests per vehicle

0.37

Avg failures per vehicle

2.8

Avg advisories per vehicle

Other model years — Mercedes Benz C 300 Amg Line Ed Prem D A: All C 300 Amg Line Ed Prem D A years → Which year to buy? →

2021

Or browse all models: Mercedes Benz →

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See how the 2020 Mercedes Benz C 300 Amg Line Ed Prem D A stacks up against a rival.

Average reliability — agree?