The 2007 BMW 650i convertible blends classic German performance with luxury and open-top cruising. But if you’re considering buying one—or already own it—you’re probably wondering how reliable it really is. While it offers an exhilarating V8 experience, this generation of the 6 Series also comes with some known mechanical and electronic concerns.
In this guide, we’ll break down the key reliability issues, common maintenance costs, and ownership tips to help you make an informed decision about the 2007 BMW 650i convertible.
Is the 2007 BMW 650i Convertible Reliable?
The 2007 BMW 650i convertible offers solid performance but only average reliability due to several common engine, electrical, and suspension issues. It requires consistent maintenance and above-average repair budgets to keep it running smoothly. Most of the issues aren’t catastrophic—but they can add up over time.
This model uses the N62 4.8L V8 engine, which delivers strong power but comes with some design flaws that affect long-term ownership costs.
Major Reliability Concerns
1. Valve Stem Seal Failure
One of the most common and expensive problems on the 650i’s N62 engine is valve stem seal failure. This leads to oil leaking into the combustion chamber, causing blue smoke at startup or while idling. It also causes increased oil consumption and potential catalytic converter damage.
- Symptoms: Blue smoke from exhaust, oil loss, check engine light
- Fix: Replacing valve stem seals can cost between $3,000–$6,000 due to labor-intensive repairs
2. Transmission and SMG Concerns
The 6-speed automatic transmission in the 650i is generally reliable but may develop issues over time with hard shifting or slipping. Regular fluid changes are critical even though BMW labels it as “lifetime” fluid (which it’s not).
- Symptoms: Harsh shifts, transmission fault codes, delayed gear engagement
- Fix: Transmission service: $300–$500; replacement: $4,000+
3. Cooling System Weak Points
The 650i cooling system includes plastic components that can become brittle and fail with age. Radiators, water pumps, and expansion tanks are all prone to leaking, which can lead to overheating and engine damage if not addressed.
- Fix: Full cooling system refresh can cost $800–$1,200
4. iDrive and Electrical Issues
The early generation iDrive system in the 2007 650i can be glitchy and frustrating. Owners report slow response, screen freezing, or failed modules. Additionally, window regulators, convertible top motors, and battery drain problems are common.
- Fix: Software updates or module replacement ($200–$1,500 depending on the issue)
5. Suspension Wear
The 650i’s heavy weight and performance suspension lead to accelerated wear on bushings, control arms, and shocks. This can cause a bouncy ride or uneven tire wear.
- Fix: Suspension rebuilds typically cost $800–$2,000 depending on how much needs replacement
Routine Maintenance Costs
Like any high-end German car, the 650i needs consistent care. Here’s a breakdown of typical maintenance items:
| Service | Estimated Cost |
|---|---|
| Oil Change | $100–$150 |
| Brake Pads & Rotors | $500–$1,000 (axle) |
| Transmission Service | $300–$500 |
| Coolant System Refresh | $800–$1,200 |
| Valve Cover Gasket | $600–$900 |
| Battery Replacement | $250–$400 |
Because it’s over 15 years old, many of these repairs may already have been done by previous owners. It’s important to ask for service records before purchasing.
Convertible-Specific Concerns
The soft top mechanism on the 650i convertible includes hydraulic motors and sensors that can fail over time. If the roof becomes misaligned or stuck, repairs can be costly.
Common Issues:
- Top won’t fully close or open
- Hydraulic fluid leaks
- Roof position sensor failure
Repair cost: $400–$2,000 depending on the issue. Periodic lubrication and sensor calibration can prevent premature failures.
Owner Feedback and Long-Term Impressions
Owners love the driving feel, power delivery, and grand touring comfort of the 650i convertible. It’s often praised for its V8 roar, well-balanced handling, and head-turning looks.
However, the car requires a “BMW tax” mentality—parts and labor aren’t cheap, and neglected maintenance can lead to expensive repairs. It’s best suited for owners who are either hands-on DIYers or willing to budget for high-end servicing.
Tips Before You Buy
- Request a full service history, especially valve stem seal work and cooling system repairs
- Have a pre-purchase inspection done by a BMW specialist
- Budget $2,000–$3,000 annually for unexpected repairs
- Check convertible top function thoroughly before buying
Pros and Cons
| Pros | Cons |
|---|---|
| Strong V8 performance | Expensive to maintain |
| Luxurious interior and design | Valve stem seal failures |
| Open-top driving fun | Glitchy electronics and iDrive |
| Good handling for a GT car | Costly suspension repairs |
Final Thoughts
The 2007 BMW 650i convertible is a stylish, powerful grand tourer that offers great driving excitement—if you’re ready for the maintenance it demands. With proper upkeep and documented service history, it can be a rewarding car. But skip or delay essential maintenance, and costs will mount quickly.
Tip: Look for enthusiast-owned examples with thorough maintenance records. Avoid cars with deferred service or mystery electrical issues unless you have a healthy repair budget or mechanical skill.