Carefully review the DPF and Timing Chain's fine print... Timing chains are typically covered by warranties, but only if you replace them according to the manufacturer's recommended mileage change or before the first mileage change. DPF isn't always easy to understand either, since it relies on a lot of moving parts to function properly. It was the EGR valve that needed replacing, but I had DPF serious headache problems, so warranties are still a viable option. The engine has to be removed in order to reach it and fix it. Fortunately, it was covered by the warranty.