Here's the short answer: a regular mechanic works on the car in your driveway. A diesel mechanic works on the truck that delivers everything that ends up in your driveway. But there's more to it than that, and if

What's the Difference and Why Should You Care? Your car breaks down, you call a mechanic. Your semi breaks down, you call a diesel mechanic. Those are not the same person and mixing them up costs real money. A