If I may, the 5k interval is a good one (if you use synthetic like Motorcraft's 5w40 and their filters), recommended by the manufacturer, and I would say they probably know better than anyone who didnt engineer it. I only say that to try and prevent you from short-changing yourself over time. I have serviced dozens upon dozens of 6.7 fleet tow trucks before (they get ran HARD), never any issues as long as its not leaking/eating oil.
Can't speak for the prevention kit. I've seen a few on some trucks, but every truck I've been involved replacing fuel components has never had it on...I have never even heard concrete confirmation that it works 100%. Like tjc said, clean fuel is the secret. Dont buy cheap crappy fuel, and don't use anything but Motorcraft fuel filters at the very least (preferably oil filter too). The pump grenades because of fuel contaminants, not just because it feels like it. Hope this helps ya a little.
