Engine Specifications The 2007 model of Peterbilt 379 has a Caterpillar C-15 engine. This engine provides  trucks with a power of 475 horsepower . This new technology engine is what truckers need for extended highway driving. This six-cylinder engine features a four-stroke cycle diesel and a compression ratio of 18:1. This engine weighs about 2,890 lbs and runs on ten gallons of oil. This engine offers a range of features, including a  real-time clock, battery backup, cool weather startup and re-programmable operational parameters that may be set by the customer. Physical Description The 2007 Peterbilt 379 features a Unibilt sleeper cabin. It has 63 inches of space to stand up. This truck is made on a steel frame and offers a 250-inch wheel base. The