The term "rebuilt engine" refers to any engine that is removed from the original vehicle, repaired, and replaced in that vehicle or any other vehicle. Unfortunately for the consumer, there are no specific standards for what type of repairs are done to a re-built engine. Some companies may only do necessary repairs, such as replacing damaged pistons or valves; others may make more through changes, such as replacing all pistons and valves. The term "remanufactured engine" refers to a used engine, or "core," which has been completely overhauled to "like-new" condition, including the replacement of all parts such as valves and pistons, and the removal and reconditioning of all parts. In terms of function, it is the equivalent of a new engine. "With a remanufactured product, you have the benefit of hindsight," said Mike Pfau of Jasper Engines. "When these original engines were designed and built, they were designed and built in a ...