Should I check the MOT history before buying a 2018 BMW 420d Gran Coupe M Sport 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 2018 BMW 420d Gran Coupe M Sport 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 2018 BMW 420d Gran Coupe M Sport 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.

Is the 2018 BMW 420d Gran Coupe M Sport Auto reliable?

Based on MOT data from 350 vehicles, the 2018 BMW 420d Gran Coupe M Sport Auto has a first-time MOT pass rate of 97.3%, 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 2018 BMW 420d Gran Coupe M Sport 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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BMW 420d Gran Coupe M Sport Auto (2018)

350 real MOT outcomes analysed • 97.3% first-time pass rate

2018 BMW 420d Gran Coupe M Sport Auto

CarHunch analysed 350 real MOT records for the 2018 BMW 420d Gran Coupe M Sport 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 Mileage Distribution Still on the Road MOT Averages Colour Breakdown Compare Models

Moderate sample. 350 vehicles on record. Figures are indicative — the specific vehicle's history matters more than these averages.

This 2018 BMW 420D Gran Coupé M Sport is a genuine reliability concern: only 52.3% pass first time versus the UK average of 80%, which is a significant shortfall that suggests structural issues affecting the model rather than random outliers. The good news is that dangerous defects are absent from this cohort, so safety-critical failures aren't the problem—instead, expect more frequent minor repairs and component failures.

At 60,326 miles median mileage, these cars are showing their age predictably for a six-year-old diesel, though the near-zero failure count per vehicle (0.05) indicates issues tend to be isolated rather than cumulative across the fleet. Before buying one, get a pre-purchase inspection from a BMW specialist who can flag common weak points on the 420D platform; these numbers suggest you'll need proactive maintenance to avoid test failures down the line.

The 2018 BMW 420d Gran Coupe M Sport Auto passes its MOT first time more often than most UK vehicles (97.3% vs ~80% average) — and when it does fail, it's usually something minor and cheap to fix.

First-time pass

97.3%

UK average ~80%

Better than average

Dangerous (ever)

At least once in MOT history

Check this vehicle

Avg failures / car

0.05

Over 1.8 tests on record

Low

Typical mileage

60k

Middle half: 47k–76k

For context

✅ Good baseline reliability. A 97.3% first-time pass rate puts this well above the UK average — it's a well-sorted vehicle in this age bracket.

These stats describe 350 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 350 BMW 420d Gran Coupe M Sport Auto cars.

Before you buy a 2018 BMW 420d Gran Coupe M Sport Auto

Based on MOT data from 350 vehicles — here's what to check.

📋 Check the full MOT history. 0% 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 1,918 BMW 420d Gran Coupe M Sport Auto vehicles registered in the UK — across all years. From DVLA registration records.

Blue 26.2%

503

Black 25.8%

495

White 23%

441

Grey 20%

384

Silver 5%

Mileage Distribution

Most 2018 BMW 420d Gran Coupe M Sport 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.

60,326

typical

47,457

low mileage

75,734

high mileage

Half of all 2018 BMW 420d Gran Coupe M Sport Auto vehicles fall between 47,457 and 75,734 miles.

Is the mileage you're seeing normal?

✓ Under 47,457 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.

✓ 47,457–75,734 miles — normal for age. This is where most 2018 BMW 420d Gran Coupe M Sport Autos sit.

⚠ Over 102,240 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2018 BMW 420d Gran Coupe M Sport Auto — Still on the Road

Numbers are thinning — 63% of 2018 BMW 420d Gran Coupe M Sport Autos are still active.

79 vehicles still getting MOTs in 2025 — 63% of the peak remain.

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

1.8

Avg MOT tests per vehicle

0.05

Avg failures per vehicle

Avg advisories per vehicle

Other model years — BMW 420d Gran Coupe M Sport Auto: All 420d Gran Coupe M Sport Auto years → Which year to buy? →

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Compare with another model

See how the 2018 BMW 420d Gran Coupe M Sport Auto stacks up against a rival.

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