The BMW M6 and 635CSi (E24) models, produced from 1987 to 1989, stand as icons of the analog-era performance car landscape. As a Phoenix owner, you possess a piece of history that not only embodies BMW's commitment to performance but also showcases the craftsmanship of hand-built BMW Motorsport in Garching. With only approximately 5,800 units produced worldwide, these grand-tourers have transitioned into a revered collector tier, often fetching between $50,000 and $100,000 for well-preserved examples.
Understanding the nuances of these models, particularly the differences between the M6 and the non-M 635CSi, is crucial for collectors. The M6, with its S38B35 engine, represents a lineage connected to the legendary M1 supercar, making it especially sought after. As you consider preserving this automotive legacy, we encourage a disciplined approach to preventive maintenance and the importance of documented appraisals for ensuring your vehicle's value in today's appreciating collector market.
📖Generation guide
E24 M6 • 1987-1988
The US-market M6 features the S38B35 3.5L 24-valve inline-six, producing 256hp. Limited to two years, this variant commands a premium in collector circles.
Euro M635CSi • 1984-1989
The Euro-spec M635CSi shares the S38B35 engine but boasts 286hp. Its grey-market status requires proper documentation for U.S. compliance.
E24 635CSi • 1984-1989
The non-M variant features the M30B35 engine, delivering 182hp, and is valued lower than the M6. It's critical to verify engine codes for accurate valuation.
Known issues by generation
Both the M6 and 635CSi (E24) have specific known issues that should be addressed to maintain their performance and value. The M6, equipped with the S38B35 engine, is known for requiring a timing chain and guide replacement at 100-150k miles, alongside the need for synchronization of its six individual throttle bodies. Common issues for the 635CSi with the M30B35 engine include head gasket failures and cooling system repairs. Rust is a significant concern, particularly around the fender lips, rear quarter panels, and rocker panel seams, making thorough inspection paramount for preservation.
Donation value by condition + generation
The E24 M6 stands as a blue-chip collector's item, with clean, original-paint examples often valued between $50,000 and $130,000 at major auctions. The strong connection to hand-built BMW Motorsport Garching adds an iron-clad authenticity to its value. Matching-numbers and original-paint are crucial for valuation, with manual transmission models commanding a substantial premium. It is essential to document any preventive maintenance and engine work, as authenticity drives value in this appreciating market.
Donation process for this model
Donating your BMW M6 or 635CSi through Wheels to Worth involves keen attention to detail and proper documentation. A qualified appraiser is recommended to ensure compliance with IRS Form 8283 Section B, as every donation crosses the $5,000 threshold. Original documentation, including matching-numbers authentication from the BMW Motorsport Garching build plate, is essential. Moreover, for grey-market Euro imports, ensure all federal compliance documentation is iron-clad to facilitate a smooth donation process.
Phoenix regional notes
As a Phoenix-based owner of a BMW M6 or 635CSi, you benefit from access to independent restorers and BMW enthusiasts who can assist in maintaining these legendary vehicles. With a vibrant community such as the BMW CCA Bimmerfest and local concours events, there are ample opportunities to connect with fellow collectors. Historical preservation is crucial, especially considering the distinct climate of the region, which can affect the chassis' integrity. Ensure your classic is stored in a climate-controlled environment to maintain its condition.
FAQ
What should I know about timing chain service for my M6?
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What is the manual transmission premium for the M6?
Are there special requirements for grey-market M635CSi imports?
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What distinguishes a factory color from a respray?
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Other model-specific guides
Vehicle Donation Resources & Guides
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