Alpina
B6
BMW
M6
Alpina B6 vs BMW M6: 2015 Comparison
The short answer
Based on available data, the BMW M6 comes out ahead of the Alpina B6 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
B6
Overall
Sentiment is highly positive among owners, characterized by deep appreciation for the brand's unique philosophy of blending high performance with exceptional ride comfort and distinctive, understated luxury. The B6 is consistently described as a "fast cruiser" or "highway missile," prized for its immense torque at low RPMs, sublime comfort over long distances, and subtle, classy aesthetics compared to more overtly sporty M models. A strong consensus exists that these vehicles offer a special, more refined driving experience than their BMW M counterparts, focusing on effortless high-speed travel rather than track-focused sharpness.
Best version to buy
Insufficient owner data available to designate a single "best" version. Discussions reference different generations (E30, F06) with different appeals.
Known issues
- ⚠Catastrophically expensive repair potential: Very frequent concern regarding the cost of parts and labor, especially for Alpina-specific components like bespoke turbos and bodywork.
M6
Overall
Sentiment is deeply polarized and highly conditional. The vehicle is universally revered for its high-revving 5.0L V10 (S85) engine, described as an "insanely fast" and "brilliant" powerplant above 5,000 RPM, offering a unique and thrilling driving experience that creates significant owner pride and excitement. However, this is heavily counterbalanced by very frequent and severe criticism regarding legendary reliability concerns and extreme ownership costs.
Best version to buy
Insufficient owner data available to designate a specific model year or trim (e.g., Competition Package) as the "best." The primary differentiator discussed is transmission choice. The 6-speed manual (6MT) is highly prized for its rarity, driver engagement, and because it avoids the notorious reliability issues of the SMG III automated manual transmission.
Known issues
- ⚠Rod bearing failures in the S85 V10 engine: considered a critical, well-documented flaw requiring preventative replacement; catastrophic engine failure risk. Frequency: very frequent.
- ⚠SMG III transmission reliability: prone to major failures, expensive repairs, and criticized for poor drivability in daily use. Frequency: very frequent.
- ⚠Throttle actuator failures: another common and expensive fault with the S85 engine. Frequency: very frequent.
The verdict
The BMW M6 is the better choice for most buyers.
It has better fuel economy on its best-equipped version than the Alpina B6, based on the data above. If power matters more to you than running costs, the Alpina B6 is worth a closer look instead.
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Frequently asked questions
Which is more reliable, the Alpina B6 or the BMW M6?
Owner reports show similar reliability sentiment for the Alpina B6 and the BMW M6. Check the known issues listed above for specific differences between the two.
Which is better for families, the Alpina B6 or the BMW M6?
The BMW M6 seats more passengers than the Alpina B6 on its catalogued best-equipped version. Body type also differs: the Alpina B6 is classed as a Coupe, the BMW M6 as a Sedan.
Which has better fuel economy, the Alpina B6 or the BMW M6?
The BMW M6 is more fuel-efficient on paper: 10.3 L/100km combined versus 10.4 L/100km for the Alpina B6, based on the best-equipped catalogued version of each.
Which is cheaper to maintain, the Alpina B6 or the BMW M6?
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.