Bmw Z4 vs Mercedes-Benz Clk
On MOT-testable defects, the Bmw Z4 (fail rate 17.1%) performed better than the Mercedes-Benz Clk (25.3%) across comparable years. The biggest divergence was suspension, where the Clk recorded failures more often.
17.1%
Z4 fail rate
25.3%
Clk fail rate
8.26pp
Difference
Side by side
| Metric | Bmw Z4 | Mercedes-Benz Clk |
|---|---|---|
| MOT tests analysed | 203,942 | 204,964 |
| Pass rate | 82.9% | 74.7% |
| Fail rate | 17.1% | 25.3% |
Where they differ
| Category | Z4 | Clk |
|---|---|---|
| Suspension | 5.7% | 14.7% |
| Lighting & signalling | 5.4% | 11.2% |
| Brakes | 4.8% | 8.2% |
| Tyres | 5.1% | 6.1% |
| Visibility | 3.3% | 4.2% |
Methodology & source. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-01. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.