5 of the Different Types of Caterpillar Engines

Top 5 Caterpillar Diesel Engines: Performance, Longevity and Parts

Caterpillar (CAT) diesel engines are known for their durability, torque, and long service life. From highway trucks to marine and construction applications, CAT engines have powered some of the toughest machines on and off the road.

In this article, we’ll highlight five of the most popular CAT diesel engines—including performance specs, use cases, and the parts you need to keep them running strong.

1. CAT 3406E

First introduced in 1993, the CAT 3406E is widely considered one of the most reliable engines Caterpillar ever produced. It marked the shift from mechanical to electronic control, making it a favorite for those who want power and tunability.

  • Horsepower: 375–550 HP
  • Used in: Peterbilt and Freightliner trucks
  • Emissions: Pre-emission engine (not California compliant)
  • Notable: Strong aftermarket support and simple rebuild process

Shop CAT 3406E rebuild kits

2. CAT C15

The CAT C15 engine came out in 1999 and built on the 3406E's foundation. It uses a single turbocharger and shares many interchangeable parts with the 3406E.

  • Horsepower: 435–625 HP
  • Used in: Heavy-duty trucks, oilfield equipment
  • Lighter than 3406E: Improved oil control
  • Production: 1999–2007 (ACERT variants followed)

Browse CAT C15 engine components

3. CAT C7

The CAT C7 was released in 2003 and was one of CAT’s last over-the-road engines. It’s known for medium-duty truck applications and uses a HEUI fuel system.

  • Horsepower: 210–300 HP
  • Used in: Box trucks, buses, vocational vehicles
  • Production: 2003–2009
  • Known Issues: Injector and HEUI system failures

Find CAT C7 parts

4. CAT 3408

The CAT 3408 is a V8 diesel engine known for massive torque output. It’s used in mining, marine, and industrial applications.

  • Horsepower: 400–520 HP
  • Configuration: V8 layout with strong internal components
  • Lifespan: Up to 16,000 hours with good maintenance
  • Common in: Marine, generators, oilfield

Shop CAT 3408 parts

5. CAT 3116

The CAT 3116 is a compact, turbocharged inline-6 diesel engine. It’s widely used in marine applications and vocational trucks.

  • Horsepower: 170–350 HP
  • Max Power: 205–350 HP at 2,400–2,800 RPM
  • Compact size: Good power-to-weight ratio
  • Watch out for: Injector seat wear (common failure point)

Find CAT 3116 rebuild components

Conclusion

CAT diesel engines have powered industries since 1925. Whether you’re restoring a 3406E or running a fleet with C15s and C7s, keeping them in top shape requires the right parts.

ATL Diesel offers high-quality rebuild kits, cylinder heads, and injectors for all major CAT engines.

Need help choosing parts? Contact our team