The short answer
Based on available data, the BMW XM comes out ahead of the BMW X5 M 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.
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
Overall
Overwhelmingly negative sentiment from the automotive community. The vehicle is widely criticized for its controversial and polarizing exterior design, frequently described as ugly, a "monstrosity," and compared to caricatures. Beyond aesthetics, it is perceived as a significant failure in its core mission as a flagship M performance SUV.
Best version to buy
Insufficient owner data available. No specific trim or version receives consistent praise or recommendation within the provided discussions.
Known issues
The verdict
The BMW XM is the better choice for most buyers.
It has stronger reliability sentiment in owner reports than the BMW X5 M, based on the data above. If the specific known issues on the BMW XM are a dealbreaker, the BMW X5 M is worth a closer look instead.
Other comparisons
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Which is more reliable, the BMW X5 M or the BMW XM?
Owner reports lean more positive on reliability for the BMW XM than the BMW X5 M. See the known issues comparison above for the specific concerns owners report on each.
Which is better for families, the BMW X5 M or the BMW XM?
Both seat a similar number of passengers based on our data. The BMW X5 M is classed as a SAV, the BMW XM as a SUV, which affects cargo space and ride height for family use.
Which has better fuel economy, the BMW X5 M or the BMW XM?
The BMW XM is more fuel-efficient on paper: 1.6-1.7 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 XM?
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the BMW X5 M than the BMW XM. See the known issues comparison above.