Proton Sl Auto Reliability, MOT Pass Rate & Common Faults
Free Proton Sl Auto car check
Is the Proton Sl Auto reliable? We analysed 963 real MOT tests across 184 vehicles to find out.
Got a specific Proton Sl Auto? Enter the reg for a free check:
The Proton Sl Auto is about average for reliability based on real UK MOT data. Common problems include constant velocity joint gaiter split, tyre tread depth below requirements of 1.6mm and brake pipe excessively corroded. Here's everything you need to know before buying a used Proton Sl Auto.
Proton Sl Auto Number Plates
Number plates registered to a Proton Sl Auto. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Proton Sl Auto MOT Pass Rate by Year
How likely is a Proton Sl Auto to pass its MOT? Here's the pass rate for each registration year, newest first.
Proton Sl Auto Problems — What Goes Wrong?
The most common reasons a Proton Sl Auto fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Proton Sl Auto Mileage — What's Normal?
How many miles does a typical Proton Sl Auto owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Proton Sl Auto MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Proton Sl Auto year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 1996 | 268 | 69.4% | 44,794 | 61,100 | 73,170 |
| 1995 | 382 | 71.7% | 43,964 | 61,501 | 79,350 |
| 1994 | 292 | 75.3% | 42,356 | 57,802 | 75,543 |
How Long Does a Proton Sl Auto Last?
Based on 184 Proton Sl Auto vehicles on UK roads.
Proton Sl Auto Mileage Distribution
Total mileage recorded across all Proton Sl Auto MOT tests. If the car you're looking at is above the 75th percentile, it's done more miles than most.
Best Year to Buy a Used Proton Sl Auto
Based on MOT pass rates across all registration years with sufficient test data.
75.3% MOT pass rate from 292 tests
69.4% MOT pass rate from 268 tests
The best year to buy a used Proton Sl Auto is 1994, which has the highest MOT pass rate at 75.3% across 292 tests. The 1996 model year has the lowest pass rate at 69.4% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the Proton Sl Auto Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Proton Sl Auto THIS CAR | 72.2% | 963 | 59,589 mi | 32 yrs |
| Proton Persona | 66% | 104,196 | 68,588 mi | 32 yrs |
| Proton GEN-2 | 70.5% | 59,272 | 46,580 mi | 22 yrs |
| Proton Wira | 70.1% | 57,151 | 47,970 mi | 26 yrs |
| Toyota Yaris Sr | 82.4% | 1,055 | 83,302 mi | — yrs |
Compared to the Proton Persona (66.0% pass rate) and the Proton GEN-2 (70.5% pass rate), the Proton Sl Auto outperforms both on MOT reliability.
Found a Proton Sl Auto you like?
Run a full vehicle history check on the specific car. See finance, stolen, write-off, mileage and MOT data for that exact vehicle.
Check a specific Proton Sl AutoShould you buy a used Proton Sl Auto?
The Proton Sl Auto has an overall MOT pass rate of 72.2% across 963 real MOT tests — roughly in line with the UK average.
The most common problems on the Proton Sl Auto are constant velocity joint gaiter split (55 recorded failures), tyre tread depth below requirements of 1.6mm (45), and brake pipe excessively corroded (40). These are the faults most likely to cause an MOT failure on this model, so check for them carefully on any test drive or pre-purchase inspection. Many are wear-and-tear items that can be budgeted for, but a car that's already failing on multiple fronts may signal neglected maintenance.
A typical Proton Sl Auto owner drives around 3,498 miles per year. If the car you're looking at is significantly above this, expect more wear on suspension, brakes and tyres. If it's well below, the vehicle may have been sitting unused — check for perished rubber, corroded discs and stale fluids.
In terms of longevity, most Proton Sl Auto models stay on UK roads for around 32 years — a strong showing that suggests solid build quality and readily available parts. If you're buying one that's already approaching that window, the data suggests it has plenty of life left provided it's been maintained.
Before committing to a purchase, we recommend running a full vehicle history check on the specific car. This will reveal any outstanding finance, stolen markers, write-off history and mileage discrepancies that the seller may not disclose — and that the MOT data alone can't tell you.