After 40,000 miles of relentless testing, Car and Driver reveals the long-term truth about the BMW M3. This high-performance sedan delivered exhilarating power and razor-sharp handling throughout its marathon journey. However, the extended evaluation uncovered notable wear on brakes and tires, along with some interior rattles and electronic quirks. Despite these issues, the M3 remained a thrilling daily driver, proving its core engineering holds up remarkably well under sustained use. This review offers honest insights for anyone considering a used M3 as a long-term investment.