It's always scary buying a used big rig and taking the chance of driving off with a bad engine. Joe Cain with American Motors out of Denver, Colorado takes you through a step-by-step process on how to properly inspect a diesel engine before making the big purchase.

Check out another "how to" on checking your tires: https://bit.ly/2EXB4q2
Want to purchase the truck used in this video? Clink on the link for a video tour: https://bit.ly/2Rs8wuk