What are the 3 main diesel engines?

There are several diesel engines produced by various manufacturers, and the popularity of specific engines can vary depending on factors such as application and region. However, three well-known and widely used diesel engines are:

1. Cummins ISX: The Cummins ISX is a heavy-duty diesel engine commonly used in trucks and buses. It is known for its reliability and performance in demanding applications.

2. Caterpillar C15: The Caterpillar C15 is another popular diesel engine, often found in heavy-duty trucks, construction equipment, and industrial applications. It is known for its power and durability.

3. Detroit Diesel DD15: The Detroit Diesel DD15 is commonly used in commercial vehicles and is known for its fuel efficiency and low emissions. It is part of the Detroit Diesel Series 60 family.

It's important to note that engine popularity can vary based on the specific industry and region. Additionally, new engine models may be introduced over time, impacting the landscape of diesel engine options.