BMW
X5 M
BMW
X6 M
BMW X5 M vs BMW X6 M: 2023 Comparison
The short answer
Based on available data, the BMW X6 M comes out ahead of the BMW X5 M on fuel economy. 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
X5 M
Overall
Sentiment is sharply divided and heavily dependent on ownership stage and financial preparedness. The vehicle is universally praised for its exhilarating performance, described as an "absolute blast to drive" with immense power and handling that is "fun to drive for an SUV." Long-term owner reports, however, convey significant caution due to very high and potentially catastrophic maintenance and repair costs, particularly for the S63 twin-turbo V8 engine. The consensus indicates deep satisfaction during the warranty period but extreme financial risk for out-of-warranty ownership, especially on higher-mileage examples.
Best version to buy
Insufficient owner data available to declare a consensus "best" version. A 2020 X5 M Competition with a clean history, low mileage, and a factory extended warranty is presented as a potentially sensible purchase within the context of this model.
Known issues
- ⚠S63 Twin-Turbo V8 Engine Long-Term Reliability: Major concerns about expensive failures and high repair costs outside warranty.
- ⚠Prohibitive Maintenance and Repair Costs: Very high costs for consumables (brakes, rotors, tires) and major repairs. Described as costing "thousands a year" to maintain properly. Frequency: very frequent.
- ⚠High-Pressure Fuel Pump (HPFP) and Fuel Injector Failures: Mentioned as a costly failure point occurring at higher mileage (e.g., around 145,000 km / 90,000 miles). Frequency: isolated.
X6 M
Overall
Mixed sentiment with a clear divide between ownership phases. The vehicle is universally praised for its immense performance, handling that defies its SUV classification, and the special, hand-built nature of its S63 engine. Long-term owner reports describe it as a highly capable and enjoyable daily driver that can handle imperfect roads and conditions while delivering sports car-like dynamics.
Best version to buy
The full X6 M is strongly recommended over the non-M X6 models (e.g., xDrive40i, M50i/M60i) for several reasons. The hand-built S63 engine in the M is reported to be more reliable than the standard N63 twin-turbo V8 found in non-M models, which is notorious for oil consumption and injector issues.
Known issues
- ⚠Catastrophic drivetrain failures: includes repeated "Drivetrain" warning messages accompanied by a complete loss of power, requiring the vehicle to be towed. One owner reported 14 separate incidents within two years.
- ⚠Engine (S63/N63) reliability concerns: issues include failing fuel injectors (often requiring replacement of all eight), excessive oil consumption, and potential for severe cylinder wall wear.
- ⚠High repair and maintenance costs: parts like laser headlights are cited as costing over $6,000 USD each. Brakes are expensive but long-lasting. General service costs are high. Frequency: very frequent.
The verdict
The BMW X6 M is the better choice for most buyers.
It has better fuel economy on its best-equipped version than the BMW X5 M, based on the data above. If power matters more to you than running costs, the BMW X5 M is worth a closer look instead.
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Frequently asked questions
Which is more reliable, the BMW X5 M or the BMW X6 M?
Owner reports show similar reliability sentiment for the BMW X5 M and the BMW X6 M. Check the known issues listed above for specific differences between the two.
Which is better for families, the BMW X5 M or the BMW X6 M?
Both seat a similar number of passengers based on our data. The BMW X5 M is classed as a SAV, the BMW X6 M as a SAC, which affects cargo space and ride height for family use.
Which has better fuel economy, the BMW X5 M or the BMW X6 M?
The BMW X6 M is more fuel-efficient on paper: 12.7-12.9 L/100km combined versus 12.9-13.1 L/100km for the BMW X5 M, based on the best-equipped catalogued version of each.
Which is cheaper to maintain, the BMW X5 M or the BMW X6 M?
Exact maintenance costs aren't in our data, but reliability signals above are the closest proxy: fewer reported issues generally means lower repair costs over time.