Are Caterpillar engine 3406C, 3406E, C15 are same engine?

Caterpillar diesel engine 3406C, 3406E, C15 are all good diesel engines. They are all widely used in our daily life. However, what’s the difference between them? Are they same engine?

The answer is no. 3406C, 3406E, C15 are different diesel engines. 3406C is the oldest one among them, and 3406E is the new generation of 3406C, C15 is the new generation based on 3406E. They are all created to meet large power requirements for people. They are all designed and manufactured for industrial application. So the answer is that no, they are different. However, they have similar design and are used for heavy duty applications.

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