BMW 635 (1984)
1984 BMW 635
CarHunch analysed 140 real MOT records for the 1984 BMW 635. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 1984 BMW 635 passes its MOT first time in just 67.6% of cases—well below the UK average of 80%—and one in five of these cars have recorded a dangerous defect at some point, which is a genuine safety concern for prospective buyers. Expect around 2.2 failures and 8.7 advisories per test, suggesting these ageing sports cars demand close attention to maintenance.
These examples have covered 115,000 miles on average, which is reasonable for a 40-year-old car, but the sheer number of advisory items flagged points to cumulative wear across multiple systems rather than one specific weak spot. Before purchase, get a full pre-buy inspection by a BMW specialist and budget for remedial work on whatever the MOT flags—these cars won't pass easily without it.
What to check before buying a 1984 BMW 635
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.
- ⚠️ 20% of these vehicles have had a dangerous defect recorded. Enter the reg below — the full MOT history will show exactly what was flagged and whether it was resolved.
- 📄 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 635
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
CarHunch may earn a small commission if you buy via these links — at no extra cost to you.
Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Petrol (99%) | 139 | 67.5% | 2.22 |
| Diesel (1%) | 1 | 70.6% | 5 |
Mileage Distribution
Most 1984 BMW 635 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 1984 BMW 635 vehicles fall between 92,582 and 140,157 miles.
1984 BMW 635 — Still on the Road
Numbers are declining — 13 vehicles still getting MOTs in 2025 (41% of peak).
Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2014–2025.
MOT History Averages
Most Common MOT Issues — 1984 BMW 635
Based on actual MOT test records for this model. Percentage shows how often each item appears across all vehicles in this cohort.
-
25.1%
Offside Rear Tyre worn close to the legal limit
-
23.3%
Nearside Rear Tyre worn close to the legal limit
-
23.3%
Windscreen washer provides insufficient washer liquid
-
22.7%
Oil leak
-
20.9%
Offside Rear Suspension component mounting prescribed area is excessively corroded
-
20.4%
Parking brake: efficiency below requirements
-
19.9%
Offside Front Brake pipe slightly corroded
-
18.9%
Nearside Rear Suspension component mounting prescribed area is excessively corroded
Data covers a 3-year window centred on 1984. Counts include advisories and failures.
Found a specific BMW 635?
Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.