I've never had the PD TDI, and had the earlier ALH thankfully. But from what I've read, by design, these engines experience accelerated cam lobe wear. The 505.01 spec anecdotally seems to accelerate the rate of this wear, while again, anecdotally, users of T6 or M1-TDT seem to find these oils slow this wear rate significantly. If I had a PD, I would lean to using T6 myself, but the Valvoline likely would serve you well also. And when the inevitable wear happens that it needs to be repaired, you should look into an aftermarket redesign which is supposed to eliminate this problem.