The Caterpillar C12 and C13 engines offer different performances for various applications. The C12 engine is available in a range of horsepower ratings from 340 to 430. The C13 engine offers horsepower ratings from 350 to 450. Both engines are available in On-Highway and Industrial versions. The On-Highway versions of the C12 and C13 engines are certified to meet the U.S. EPA's 2007 standards for on-highway heavy duty engines, while the Industrial versions meet the same standards as their predecessors.

Caterpillar C12 and C13 engines for sale both have six cylinders, but the C13 is a bit longer than the C12. The C13 also has a higher compression ratio, so it's more powerful. And because of its extra length, the C13 can hold more fuel than the C12. That means it can go longer between fill-ups, which is important for long-haul truckers.

The Caterpillar C12 and C13 engines are both popular choices for heavy-duty trucking applications. But which one is the better performer? Let's take a look at some key performance specs to see which engine comes out on top.

The C12 engine has a peak horsepower of 520, while the C13 produces up to 630 horsepower. When it comes to torque, the C12 delivers 1,550 lb-ft, while the C13 offers an impressive 1,750 lb-ft. So it's clear that the C13 has a slight edge in terms of power and performance.

Another key difference is fuel efficiency. The C12 is rated at 7 miles per gallon, while the C13 gets 8 miles per gallon.