The BMW 850i, especially the 1991 model, holds a certain allure. Its sleek lines and V12 engine whisper promises of grand touring in style. But beneath the surface of this automotive beauty lies a complex machine that can be as challenging as it is captivating. If you’re considering a ’91 Bmw 850i, you’re likely drawn to its striking aesthetics and the prestige of that V12. Let’s delve into what you need to know before taking the plunge, drawing on insights from owners and enthusiasts.
The Allure of the 850i: Beauty and the V12
There’s no denying the visual appeal of the BMW 850i. Even today, its design stands out, a testament to its timeless elegance. Many are initially attracted to the 850i simply because it’s “gorgeous,” as one enthusiast puts it. Adding to the appeal is the V12 engine. It’s a V12! That badge alone carries significant weight and prestige. Originally designed for the BMW 7 Series with Autobahn cruising in mind, the 5.0L V12 in the 850i offers a unique driving experience. It’s smooth, powerful, and definitely has a “cool factor” that’s hard to ignore.
The Reality Check: Maintenance, Costs, and Reliability
However, the dream of 850i ownership can quickly turn into a reality check when considering maintenance and reliability. The forum discussions are filled with cautionary tales. A recurring theme is the “nightmarish electrical problems” common in rougher examples. The 850i, being a product of early 90s BMW luxury, is packed with technology that, decades later, can become problematic.
One of the most significant points raised is the presence of two ECUs – one for each bank of cylinders. This complexity extends to many systems within the car, essentially doubling potential points of failure and increasing repair costs. Parts availability from BMW is generally good, but “it doesn’t come cheap.” Used parts from the 7 Series, which shares the same engine, might be cheaper, but dealing with a “25-year-old broken 7” part can still be risky.
Engine Quirks and Performance
While the V12 is undoubtedly a highlight, it’s not without its drawbacks. Despite its displacement, extracting significant horsepower beyond the stock output “takes serious custom work.” The engine, designed for fuel economy at high speeds rather than outright performance, has limitations in its heads and exhaust port design for high flow. Performance-wise, the 850i is described as a “cool tourer” rather than a particularly fast car. It’s more about comfortable cruising than blistering acceleration.
Manual vs. Automatic Transmission
The original poster specifically mentioned an automatic 850i. While manual versions exist, they are uncommon. Interestingly, some opinions suggest the automatic might actually be the better choice for the 850i in terms of reliability and overall character. Manual transmission parts can be “NLA” (no longer available), potentially creating significant issues for maintenance down the line. The automatic, while perhaps less engaging for some drivers, may offer a more trouble-free ownership experience.
The Financial Aspect: A Potential Money Pit
Perhaps the most consistent warning about the 1991 BMW 850i revolves around cost. Many forum participants use terms like “money pit” and advise staying away unless you are prepared for potentially high expenses. Stories of previous owners spending exorbitant amounts on repairs are common. Even well-maintained examples can present hefty bills when things do break. Components like headlight motors, DK motors (likely referring to throttle actuators or similar), and various trim pieces are known to be expensive and sometimes hard to find.
Alternatives and Considerations
For those still drawn to the idea of an 8 Series, some forum members suggest considering the 840i as an alternative. The V8 version is mentioned as being “nearly as fast” and potentially less complex and costly to maintain. Swapping an 840i to a manual transmission is also considered easier and cheaper than doing the same for a V12. Comparisons to newer 5 Series models are also made, suggesting that for the money spent on maintaining an 850i, a more modern and potentially more reliable 5 Series might be a more sensible option. Even the Porsche 928, another grand tourer of the era, is brought up as a potentially more desirable, albeit also complex, alternative.
Conclusion: Beauty Comes at a Price
The 1991 BMW 850i is undeniably a beautiful and iconic car. The V12 engine adds a layer of prestige and a unique driving experience. However, prospective buyers must be fully aware of the potential downsides. Maintenance can be expensive and complex, reliability can be a concern, and parts, while generally available, are not cheap. Owning an 850i is likely a labor of love, one that requires deep pockets and a tolerance for potential headaches. If you’re prepared for the realities of 91 BMW 850i ownership, it can be a rewarding experience. But for the faint of heart, or those on a tight budget, this grand tourer might be more of a nightmare than a dream.
