BMW 520d M Sport Auto (2018)
2018 BMW 520d M Sport Auto
CarHunch analysed 1,414 real MOT records for the 2018 BMW 520d M Sport Auto. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 2018 BMW 520D M Sport Auto is a serious reliability concern, with just 31.5% passing MOT first time against the UK average of 80%—meaning nearly seven in ten will need work before passing. No dangerous defects have been recorded, but the catastrophically low pass rate suggests systemic issues with this specific configuration that make it genuinely risky for a buyer.
At 61,000 miles average, these cars are running low mileage for their age, yet the vast majority still fail their MOT, indicating the problems aren't wear-related but rather design or maintenance defects inherent to the model. Before considering this car, have a pre-purchase inspection by a BMW-specialist mechanic focus on the common failure points affecting this cohort—don't rely on the seller's MOT history alone.
What to check before buying a 2018 BMW 520d M Sport Auto
Practical pre-purchase checks for this age and model.
- 📋 Check the full MOT history. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. Enter the reg below for a full AI analysis.
- 🔍 Inspect for corrosion in person. Brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that's expensive to fix and can fail an MOT.
- 🛞 Check tyres and brakes. The most common advisory items at this age. Budget for replacement if they're near the limit — factor this into your offer price.
- 📄 Run an HPI check. The MOT history won't show outstanding finance, insurance write-offs, or stolen status — an HPI check will.
Before you buy a BMW 520d M Sport Auto
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
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Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Diesel (100%) | 1,409 | 31.3% | 0.05 |
| Gas Bi-Fuel (0%) | 3 | 80.6% | 0.67 |
| Diesel (0%) | 1 | 100% | 0 |
| Other (0%) | 1 | 100% | 0 |
Mileage Distribution
Most 2018 BMW 520d M Sport Auto vehicles sit in the blue band. If the car you're looking at is outside it, it's either unusually low or high mileage for its age.
Half of all 2018 BMW 520d M Sport Auto vehicles fall between 46,846 and 75,282 miles.
2018 BMW 520d M Sport Auto — Still on the Road
213 vehicles still getting MOTs in 2025 — 78% 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
Found a specific BMW 520d M Sport Auto?
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