Where each one leads
Mercedes-Benz GLC
- Fewer Mercedes-Benz GLC cars in the Netherlands carry an illogical odometer record (2.4% against 2.8%).
- New Mercedes-Benz GLC cars registered in Europe in 2022 average 129 g/km of CO₂ on the WLTP test, against 250 for the Porsche Cayenne in 2022.
Porsche Cayenne
- Against cars of the same age, the Porsche Cayenne comes out better at its first MOT test (passes 16% more often than average) than the Mercedes-Benz GLC (passes 5% more often than average).
Too close to call: real-world fuel use in Europe, petrol (l/100 km).
Only measures that do not depend on how many cars were sold: pass and failure rates against cars of the same age, ratings, fuel use and CO₂. How we compare
At a glance
| Mercedes-Benz GLC | Porsche Cayenne | |
|---|---|---|
| Model years in the US safety record | 2015–2023 | 2003–2026 |
| New cars registered in Europe | 640,588 (2015–2022) | 52,584 (2010–2022) |
| Licensed in the United Kingdom | 98,346 | 40,392 |
| On the road in the Netherlands | 25,833 | 15,174 |
| In traffic in Finland | 12,123 | — |
EEA new-car registrations (CC BY 4.0) · DVLA licensed vehicles (OGL v3.0) · RDW (CC0) · Traficom (CC BY 4.0) · generations: Wikidata (CC0).
Reliability and problems
| Mercedes-Benz GLC | Porsche Cayenne | |
|---|---|---|
| UK MOT first-time pass rate | 88% | 84% |
| … against cars of the same age | +5% | +16% |
| New York safety inspections failed | — | 0.6% |
| … against cars of the same year | — | −55% |
| Illogical odometer records (NL) | 2.4% | 2.8% |
| US owner complaints | 24 | 506 |
| Most complaints about | Service brakes | Power train |
| Model year with most complaints | 2017 (13) | 2014 (53) |
| US recall campaigns | — | 27 |
| Manufacturer service bulletins | 273 | 6,986 |
| NHTSA defect investigations | 2 | 11 |
Complaint, recall and bulletin counts grow with the number of cars sold and are not adjusted for it. UK MOT: DVSA anonymised MOT results (OGL v3.0); New York: DMV inspections; complaints, recalls, bulletins and investigations: NHTSA (public domain); odometer: RDW (CC0).
Safety
| Mercedes-Benz GLC | Porsche Cayenne | |
|---|---|---|
| NHTSA overall rating | 5★ (2021) | — |
NHTSA New Car Assessment Program, most recent rated model year (public domain).
Fuel, emissions and price
| Mercedes-Benz GLC | Porsche Cayenne | |
|---|---|---|
| Official combined fuel use, Canada | — | 12.2 l/100 km (2026) |
| Real-world use in Europe, diesel hybrid | 6.6 l/100 km | — |
| Real-world use in Europe, diesel | 7.6 l/100 km | — |
| Real-world use in Europe, petrol hybrid | 9.5 l/100 km | — |
| Real-world use in Europe, petrol | 13.1 l/100 km | 13.1 l/100 km |
| Official CO₂ of new cars in Europe | 129 g/km | 250 g/km |
| Average power of new cars in Europe | 156 kW (209 hp) | 253 kW (340 hp) |
| Average mass in running order | 1,960 kg | 2,125 kg |
| Dutch list price when new (median) | €77,065 | €136,247 |
| Average odometer in Finland | 123,000 km | — |
Canada: NRCan Fuel Consumption Ratings, most frugal version of the latest year (OGL Canada). Europe: EEA monitoring of new-car CO₂ and on-board fuel meters (OBFCM), CC BY 4.0. Price: RDW catalogue price (CC0). Finland: Traficom (CC BY 4.0).