2012 Chevrolet Silverado 3500 HD Questions

Unanswered 2012 Chevrolet Silverado 3500 HD Questions

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I drove it 14 miles nothing seems to be wrong with it yet. I'm Going to drain the tank. Just wondering if I need to do anything else before I drive it
Tried to replace with expensive top of the range light bulbs, but am still having the same problem. Has anybody else experienced this?
What causes the diesel brake exhaust system to smoke when I come to a stop light on my 2012 3500 HD diesel truck with Allisontransmissionand what can I do