After years of driving a W700, I've bid for a new route that uses a Sprinter exclusively. My DOT card expires in 2 months. I'm getting conflicting answers about needing to be qualified as a DOT driver for a sprinter. Some say there is no need to take the exam anymore. Is this true? I'm getting up there age wise and really bidded for this new route because I am only 3 years away from retirement. Feedback?