Diesel Mercedes-Benz Viano: MOT pass rate
70.9% of diesel Mercedes-Benz Vianos pass the MOT first time, measured across 4,855 DVSA tests on that fuel type alone. Average mileage at test was 156,497.
Diesel against the other Mercedes-Benz Viano versions
| Fuel | Pass rate | Tests |
|---|---|---|
| Diesel | 70.9% | 4,855 |
| Petrol | 75% | 535 |
| All Mercedes-Benz Viano | 71.3% | 5,395 |
Why the fuel type changes the number
Diesels carry DPFs, EGR valves and stricter smoke limits, so emissions and exhaust faults account for failures petrol cars never see.
On the Mercedes-Benz Viano specifically, petrol is the strongest at 75%, and this diesel version sits 0.4 points below the 71.3% model average.
What it means if you are buying one
There is little to choose between fuel types on this model, so decide on running costs and mileage rather than MOT record. Check the exact car, decode the VIN and check the mileage before you bid.
Mileage is part of the answer
The average diesel Mercedes-Benz Viano had covered 156,497 miles at test, against 81,176 for the petrol. That is very high mileage. Clutches, dual-mass flywheels and head gaskets have usually been through at least one repair by this point, so ask for evidence rather than assume the car is original everywhere.
Fuel type and mileage are tangled together: diesels are usually bought by higher-mileage drivers, so some of any gap between fuels is the miles rather than the engine. The per-year figures on the Mercedes-Benz Viano page separate age from fuel if you want to isolate one.