Looking for reliable information about the CAT C15 engine? Learn why this 15.2L heavy-duty diesel engine remains a popular choice for owner-operators and fleet managers. Our guide covers CAT C15 engine specs, horsepower, torque, history, fuel consumption, common problems, and what to consider before buying in 2026. Discover how the C15 compares with newer engines, why its rebuild capability and durability continue to make it a preferred option for demanding applications, and what to inspect before purchasing. You'll also learn about ACERT technology, overheating concerns, oil leaks, fuel system wear, and practical tips to help avoid costly repairs. Whether you're researching replacement options or planning your next engine purchase, this guide provides the information you need to make a confident decision. Explore expert insights and find professionally inspected CAT engine options backed by more than 25 years of diesel engine experience. Read the complete guide today or contact HD Engines for expert assistance with your engine needs. Connect with our Diesel Engine Dealer for more information.