What’s better than a $3,000 Duramax? A $3,000 Duramax that runs! We used our El Segundo, California, shop to assess the condition of our newest diesel. Although it looked pretty rough, our 6.6L Duramax diesel engine seemed to be in good shape. There was no smoke out the tailpipe during startup, and other than some ticking and belt squeal, we had high hopes that our engine was in great condition.