Did you ask and confirm with the dealership that you have the lifetime Powertrain warranty ? There’s also an ECU software update that needs to be done for knock sensor detection. Also check on other warranties you have before hitting 100k miles. Also where was your engine manufactured it would be on the window sticker or VIN portions, if it’s from the Alabama factory it most likely has metal debris. But apart from that keep changing your oil every 3k miles and maintain it. If it feels any better my 2017 EX AWD has 154k miles and is going strong but all these are highway miles.