The BMW M6 and 635CSi (E24) represent the zenith of the analog-era grand-tourers, produced from 1987 to 1989 for the US market and prior for the Euro. With approximately 5,800 units crafted worldwide, this model is a jewel in the collector's crown, showcasing the craftsmanship of BMW Motorsport Garching. As a manual-transmission enthusiast, you’ll appreciate the significant collector premium that comes with E24 M6 examples compared to their automatic counterparts. These beauties marry performance with luxury, embodying the true spirit of grand touring.
Your donation not only supports Cascade Car Exchange but also helps preserve the legacy of these iconic vehicles. Ensuring that these classic M cars remain on the road requires a commitment to preventive maintenance and restoration. We highly recommend using qualified appraisers with documented experience in BMW Motorsport to ascertain the authenticity and value of your vehicle, thus guaranteeing it receives the respect it deserves in the collector community.
📖Generation guide
E24 M6 • 1987-1988
The US-market E24 M6 features the S38B35 3.5L I6 engine, producing 256hp. Manual versions are particularly sought after, commanding a premium in the collector market.
E24 M635CSi • 1984-1989
The Euro-market M635CSi shares the same S38B35 engine but generates 286hp. Its rarity and performance pedigree mark it as a distinguished collector's item.
E24 635CSi • 1984-1989
The non-M variant utilizes the M30B35 engine, offering 182hp in the US-spec. While valued lower than the M versions, clean examples are still highly desirable.
Known issues by generation
The S38B35 engine found in the M6 is known to require timing chain replacements between 100,000-150,000 miles, with symptoms such as chain rattle indicating the need for service. In contrast, the M30B35 engine in the 635CSi can experience head gasket failures and often requires maintenance on the thermostat and water pump. Both models benefit from regular throttle body synchronization for optimal performance. Rust issues, particularly around the A-pillar drip rail and other seams, are common in E24 chassis, especially in salt-belt regions. Understanding these potential pitfalls is essential for any owner or donor considering their vehicle's historical integrity and value.
Donation value by condition + generation
The collector market for BMW M cars has been exceptionally robust, particularly for the hand-built M6 and M635CSi models. Models with matching numbers and verified build plates from BMW Motorsport Garching are essential, and their values can range significantly based on condition. Original paint colors such as Diamond Black and Cinnabar Red hold a premium, while any factory color changes raise red flags among collectors. Manual transmission variants of the M6 command a notable collector premium, reflecting the desirability of driving purity in this era. With values on the rise, these vehicles represent smart investments for discerning collectors.
Donation process for this model
Donating your BMW M6 or 635CSi is a straightforward yet crucial process to ensure proper valuation and documentation. We strongly recommend seeking a qualified appraiser with experience in BMW Motorsport vehicles to assess the value of your car and provide the necessary IRS Form 8283 Section B. Every donation typically crosses the $5,000 threshold many times over, emphasizing the need for meticulous documentation, including matching numbers and original paint verification. Also, for Euro-import models, ensure compliance with federal regulations, as this documentation is vital in preserving your car's value in the collector marketplace.
Oregon regional notes
Oregon is home to a vibrant community of vintage BMW enthusiasts, with numerous specialists available for restoration and maintenance of your M6 or 635CSi. The state hosts events like the BMW CCA Bimmerfest and Legends of the Autobahn, which celebrate these iconic vehicles. Understanding the local climate's impact on vehicle preservation is critical, especially for rust-susceptible E24 chassis. Additionally, climate-controlled storage options are recommended for low-mileage examples to maintain their value and integrity.
FAQ
What is the timing chain service interval for the S38B35 engine?
How can I authenticate my car as a genuine M6?
Is there a significant premium for manual transmission models?
What documents are needed for donating a Euro-import M6?
How can I verify the condition of my M6's original paint?
What is the importance of a qualified appraiser for my donation?
Are there any common rust issues to be aware of?
Other model-specific guides
Vehicle Donation Resources & Guides
In-depth tax, paperwork, and donation logistics guides published by our editorial team — bookmark these before you donate.