1975 Mercedes 350 Sl Auto MOT Pass Rate
Pass rate for 350 Sl Auto models manufactured in 1975, based on 89 real MOT test results.
Data from official DVSA MOT testing records
1975 Mercedes 350 Sl Auto MOT Analysis
The 1975 Mercedes 350 Sl Auto has an MOT pass rate of 64.0% based on 89 tests — around the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 104,783 miles on the odometer. With a 36.0% failure rate, the 1975 350 Sl Auto is rated as "Average" for MOT reliability.
The leading cause of MOT failure for the 1975 Mercedes 350 Sl Auto is Suspension, responsible for 12.4% of failures. Suspension failures typically involve worn bushes, leaking shock absorbers, broken coil springs, and damaged suspension arms. These affect ride quality, tyre wear, and road holding. Typical repair costs range from £200–500. Brakes is the second most common issue at 7.9%. Lamps, Reflectors and Electrical Equipment follows at 7.9%.
Top failures specific to 1975 models only. The overall 350 Sl Auto page may show different rankings.
What Fails Most
What Fails on This Car?
Click a category to see specific failure items.
View as table
| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Suspension | 12.4% | 11 |
| 2 | Brakes | 7.9% | 7 |
| 3 | Lamps, Reflectors And Electrical Equipment | 7.9% | 7 |
| 4 | Exhaust, Fuel And Emissions | 2.2% | 2 |
| 5 | Seat Belts And Supplementary Restraint Systems | 2.2% | 2 |
| 6 | Body, Structure And General Items | 2.2% | 2 |
| 7 | Driver's View Of The Road | 1.1% | 1 |
| 8 | Steering | 1.1% | 1 |
Failures per 10,000 Miles
avg. 104,783 miFor every 10,000 miles driven, this shows what percentage of MOT tests fail for each category. This accounts for how far cars are actually driven, not just raw pass/fail counts.
View as table
| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Suspension | 1.18 | 12.4% | 11 |
| Brakes | 0.75 | 7.9% | 7 |
| Lamps & Electrical | 0.75 | 7.9% | 7 |
| Emissions & Exhaust | 0.21 | 2.2% | 2 |
| Seat Belts | 0.21 | 2.2% | 2 |
| Body & Structure | 0.21 | 2.2% | 2 |
| Visibility | 0.11 | 1.1% | 1 |
| Steering | 0.11 | 1.1% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1975 Mercedes 350 Sl Auto has an MOT pass rate of 64.0% based on 89 tests — around the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 104,783 miles on the odometer. With a 36.0% failure rate, the 1975 350 Sl Auto is rated as "Average" for MOT reliability.
If you own or are considering buying a 1975 Mercedes 350 Sl Auto, budget for potential repairs before each MOT. Before your MOT, pay particular attention to suspension: Look for uneven tyre wear, listen for clunking over bumps, and check if the car pulls to one side. A bouncy ride suggests worn shock absorbers. Visually inspect coil springs for cracks. With an average mileage of 104,783 miles, these vehicles are in the higher-mileage bracket where wear-related failures become more common.
Suspension — 12.4% of failures
Suspension issues account for 12.4% of MOT failures on 1975 Mercedes 350 Sl Auto models. Suspension failures typically involve worn bushes, leaking shock absorbers, broken coil springs, and damaged suspension arms. These affect ride quality, tyre wear, and road holding. Typical repair costs: £200–500. Pre-MOT check: Look for uneven tyre wear, listen for clunking over bumps, and check if the car pulls to one side. A bouncy ride suggests worn shock absorbers. Visually inspect coil springs for cracks.
Brakes — 7.9% of failures
Brakes issues account for 7.9% of MOT failures on 1975 Mercedes 350 Sl Auto models. Brake-related failures include worn brake pads, corroded brake discs, leaking brake lines, and faulty brake servos. These are safety-critical components — any brake deficiency will result in an MOT fail. Typical repair costs: £150–400. Pre-MOT check: Listen for squealing or grinding noises. Check brake pedal feel — if it feels spongy or goes to the floor, have the system inspected immediately. Look at brake pad thickness through the wheel spokes (minimum 3mm).
Lamps, Reflectors and Electrical Equipment — 7.9% of failures
Lamps, Reflectors and Electrical Equipment issues account for 7.9% of MOT failures on 1975 Mercedes 350 Sl Auto models. Lighting failures cover all external lights: headlights, tail lights, brake lights, indicators, fog lights, and reflectors. A single blown bulb will cause an MOT fail. This is one of the most preventable failure categories. Typical repair costs: £5–50. Pre-MOT check: Walk around the car and check every light — headlights (dipped and main beam), side lights, tail lights, brake lights, indicators, hazard lights, reverse light, rear fog light, and number plate lights. Replace any blown bulbs before the test.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.