BMW
M5
Porsche
Panamera
BMW M5 vs Porsche Panamera: 2024 Comparison
The short answer
Based on available data, the Porsche Panamera comes out ahead of the BMW M5 on fuel economy and power. Check the specs table and owner sentiment below for the full comparison before deciding between the two. Both are covered by real owner reports on CarWizz.
Specs side by side
What owners say
M5
Overall
Sentiment is sharply divided by generation and is heavily influenced by ownership costs. The E60 generation (V10 S85 engine) is universally described as an unreliable "money pit" and "heap of junk" with catastrophic engine failure risks, particularly concerning rod bearings, leading to extremely high maintenance costs. The F90 generation (V8 S63 engine) receives a more positive reception for its brutal performance, all-wheel drive capability, and modern luxury, but is still acknowledged as a very expensive vehicle to maintain properly.
Best version to buy
F90 Competition (pre-hybrid V8): This generation is frequently cited as the "last good M5," praised for its reliability relative to the V10, monstrous performance from its twin-turbo V8, and attractive design. It is seen as a peak of the traditional M5 formula before the added weight and complexity of the hybrid G90.
Known issues
- ⚠Catastrophic engine failure (E60 V10 S85): Rod bearing failures leading to seized engines; described as one of the least reliable BMW engines ever made. Frequency: very frequent.
- ⚠Extremely high maintenance/repair costs: Described as an "absolute fortune" to maintain, with reports of $20,000+ spent over 10 years for low-mileage cars; major service bills anticipated as mileage approaches 100,000 km.
- ⚠Hybrid system and weight drawbacks (G90): Numb brake feel due to regen, excessive mass, and electromechanical systems that detract from driver engagement; noted quality control issues like missing door assemblies and non-functional heaters…
Panamera
Overall
Sentiment is deeply divided and heavily dependent on model year, powertrain, and ownership expectations. Long-term owners of V8-powered models, particularly the GTS and Turbo variants from the second generation (2017+), frequently praise them as among the best daily drivers they have ever owned, citing a blend of exceptional performance, practicality, safety, and surprising reliability with proper maintenance. However, significant and severe criticism is directed at the E-Hybrid models, especially first-generation examples, which are described as profoundly unreliable with catastrophic electrical failures, frequent breakdowns, and extremely short hybrid battery life (reportedly 3-5 years).
Best version to buy
Second-generation (2017+) V8 models, specifically the GTS and Turbo variants. The GTS is highlighted for its intoxicating engine character and as a sweet spot in the lineup.
Known issues
- ⚠Catastrophic E-Hybrid system failures: including complete electrical system failures, stranding owners, requiring frequent towing, and very short hybrid battery life (3-5 years). Frequency: very frequent for first-generation hybrids.
- ⚠Air suspension failures: compressor and component failures, typically occurring after 50,000-70,000 miles, with repairs costing several thousand dollars. Frequency: very frequent.
- ⚠High maintenance and repair costs: extremely expensive parts (e.g., tyres, brakes), dealer service, and repairs; described as "running a £70,000 car" even when purchased used. Frequency: very frequent.
The verdict
The Porsche Panamera is the better choice for most buyers.
It has better fuel economy on its best-equipped version than the BMW M5, based on the data above. If power matters more to you than running costs, the BMW M5 is worth a closer look instead.
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Common problems by model year
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Frequently asked questions
Which is more reliable, the BMW M5 or the Porsche Panamera?
Owner reports show similar reliability sentiment for the BMW M5 and the Porsche Panamera. Check the known issues listed above for specific differences between the two.
Which is better for families, the BMW M5 or the Porsche Panamera?
The BMW M5 seats more passengers than the Porsche Panamera on its catalogued best-equipped version. Body type also differs: the BMW M5 is classed as a Station wagon, the Porsche Panamera as a Liftback.
Which has better fuel economy, the BMW M5 or the Porsche Panamera?
The Porsche Panamera is more fuel-efficient on paper: 1.4-1.6 L/100km combined versus 2.0 L/100km for the BMW M5, based on the best-equipped catalogued version of each.
Which is cheaper to maintain, the BMW M5 or the Porsche Panamera?
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Porsche Panamera than the BMW M5. See the known issues comparison above.