The BMW M6 and 635CSi (E24), produced between 1987 and 1989, epitomize the pinnacle of grand touring performance. As part of the esteemed BMW M line, these vehicles, with only about 5,800 produced worldwide, are not just cars; they are rolling pieces of automotive history. In San Antonio, we honor the legacy of these iconic models, which are increasingly sought after by collectors and enthusiasts alike. With their hand-built BMW Motorsport Garching engines, these vehicles are characterized by a unique and thrilling driving experience.
Donating your vehicle to Ride Again allows you to contribute to the preservation of this extraordinary lineage. Whether you own a pristine example of the US-market M6 or a Euro-market 635CSi, your donation supports a community that values the rich heritage and craftsmanship of BMW's M division. These models require preventive maintenance, and we emphasize the importance of keeping records for all services, especially for collectors aiming to uphold the integrity of these grand touring cars.
📖Generation guide
E24 M6 • 1987-1988
The US-market M6 features the S38B35 engine, generating 256hp, and is characterized by its manual transmission. This two-year production run creates significant collector interest due to its rarity and performance pedigree.
Euro M635CSi • 1984-1989
This model benefits from a more powerful Euro-spec S38B35 engine with 286hp. Its longer production run enhances its collectibility but requires proper documentation for US-market compliance.
635CSi (non-M) • 1984-1989
Featuring the lower-tier M30B35 engine, this model produces 182hp. While less sought after than the M variants, it remains a stylish option for enthusiasts and can still be a rewarding collector's item depending on condition.
Known issues by generation
Each model carries its own set of known issues that potential owners should be aware of. The S38B35 engine in the M6 requires timing-chain and guide replacements at approximately 100-150k miles, with preventive servicing costing $3-6k at a qualified specialist. The M30B35 engine may experience head-gasket failures and other cooling system issues. Proper maintenance of the throttle bodies is critical for drivability, and the authenticity of engine numbers must be verified. Rust is a common concern, particularly in salt-belt areas, necessitating thorough inspection and potential costly repairs, especially at key structural areas of the E24 chassis.
Donation value by condition + generation
The E24 M6 and 635CSi represent a unique investment opportunity in the blue-chip automotive collector market. Clean, original-paint examples of the M6 can command values between $50,000 and $130,000, with manual transmission models achieving significant premiums. Collectors must ensure matching numbers and proper documentation of any service records, especially for timing-chain replacements, to validate the vehicle's worth. Original paint colors are critical to maintain collector value, and any factory color changes can raise red flags. For both M and non-M variants, engaging with a qualified appraiser is essential to receive accurate valuations based on current market trends.
Donation process for this model
To donate your BMW M6 or 635CSi, we strongly recommend involving a qualified appraiser with documented credentials in vintage BMW or Motorsport vehicles. Due to the high value of these models, the IRS Form 8283 Section B will apply, as every donation crosses the $5k threshold significantly. Enclosed transport is recommended to ensure the vehicle's condition remains pristine during transfer. Additionally, documentation such as the BMW Motorsport Garching build plate and matching-engine VIN verification is mandatory for authenticity, especially for grey-market Euro-import models.
San Antonio regional notes
San Antonio offers a vibrant community for BMW enthusiasts, with access to independent specialists familiar with the nuances of the M6 and 635CSi. Vintage car events, such as BMW CCA Bimmerfest, provide great networking opportunities, while local restoration shops can help maintain these classic machines. The region's sun-belt climate is generally kinder to vehicle preservation than rust-prone salt-belt areas, making San Antonio a desirable location for collectors to store their vehicles in climate-controlled environments.
FAQ
What are the key maintenance intervals for the S38 engine?
How can I verify the authenticity of my M6 or 635CSi?
Is there really a significant premium for manual transmission models?
What should I know about federal requirements for grey-market imports?
How do I assess the condition of the interior before donating?
What are the red flags for factory color changes?
Why is a qualified appraiser recommended for donations at this level?
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.