Hi, 2019 F350C's. They require flywheel replacement at ~80hrs of operation in a certain rpm range; 3500-5000 maybe? The engine monitor will alert you and the job is done in less than a day w/ no cost...currently. I only have 7 hours in the new-to-us boat and the boat only has 60 hrs. total, I am still learning ocean boating, but given the type of boating we expect to do I can't see spending much time in that range. We are usually puttering around for fun or running around Buzzards Bay and Vinyard Sound.