by Courtney Davis | Jun 6, 2025 | Diagnostic Guides and Troubleshooting, Diesel Repair, Maintenance Tips and Procedures
The 2003 Caterpillar C15 remains one of the most widely used heavy-duty diesel engines in the industry. Known for its durability, raw power, and long-term reliability, the C15 powers many of the long-haul trucks and vocational vehicles still running strong today. This...