Should I check the MOT history before buying a 2018 Mutt Mongrel 125?

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 Mutt Mongrel 125?

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 Mutt Mongrel 125?

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 Mutt Mongrel 125 reliable?

Based on MOT data from 432 vehicles, the 2018 Mutt Mongrel 125 has a first-time MOT pass rate of 78.1%, 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 Mutt Mongrel 125?

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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Mutt Mongrel 125 (2018)

432 real MOT outcomes analysed • 78.1% first-time pass rate

2018 Mutt Mongrel 125

CarHunch analysed 432 real MOT records for the 2018 Mutt Mongrel 125. 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

Moderate sample. 432 vehicles on record. Figures are indicative — the specific vehicle's history matters more than these averages.

The 2018 MUTT MONGREL 125 falls well below the UK average with a first-time pass rate of just 62.4% against the national 80%, signalling meaningful reliability concerns for this model year. Nearly one in five of these vehicles (19.4%) have recorded a dangerous defect during their MOT history, which is a genuine buyer worry.

At under 5,000 miles median mileage, these aren't high-use bikes, yet they're averaging 0.78 failures per test—suggesting design or build issues rather than wear-and-tear. Check the full MOT history of any example you're considering and budget for preventative work on common failure points, particularly around whatever systems generated those dangerous defects.

The 2018 Mutt Mongrel 125 passes its MOT first time at roughly the UK average rate (78.1%) — 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

78.1%

UK average ~80%

Around average

Dangerous (ever)

19.4%

At least once in MOT history

Check this vehicle

Avg failures / car

0.78

Over 3.1 tests on record

Moderate

Typical mileage

Middle half: 3k–8k

For context

🔧 Average reliability. Passes at roughly the UK rate — not a standout, not a problem vehicle. Individual history makes all the difference.

🔧 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 432 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 432 Mutt Mongrel 125 cars.

Before you buy a 2018 Mutt Mongrel 125

Based on MOT data from 432 vehicles — here's what to check.

📋 Check the full MOT history. 19.4% 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
Petrol (99%)	429	78.2%	0.77

Colour Breakdown

Based on 2,026 Mutt Mongrel 125 vehicles registered in the UK — across all years. From DVLA registration records.

Black 79.3%

1,607

Grey 10.8%

218

Green 3.9%

Silver 2.4%

Orange 1.2%

Blue 1.1%

White 0.6%

Bronze 0.6%

Mileage Distribution

Most 2018 Mutt Mongrel 125 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.

4,829

typical

2,536

low mileage

7,795

high mileage

Half of all 2018 Mutt Mongrel 125 vehicles fall between 2,536 and 7,795 miles.

Is the mileage you're seeing normal?

✓ Under 2,536 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.

✓ 2,536–7,795 miles — normal for age. This is where most 2018 Mutt Mongrel 125s sit.

⚠ Over 10,523 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2018 Mutt Mongrel 125 — Still on the Road

Numbers are thinning — 65% of 2018 Mutt Mongrel 125s are still active.

139 vehicles still getting MOTs in 2025 — 65% of the peak remain.

Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2021–2025.

MOT History Averages

3.1

Avg MOT tests per vehicle

0.78

Avg failures per vehicle

1.6

Avg advisories per vehicle

Other model years — Mutt Mongrel 125: All Mongrel 125 years → Which year to buy? →

2016 2017 2019 2020 2021 2022

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Average reliability — agree?