I was never comfortable playing the dealer warranty game when my bikes were newer. Funny thing I actually bought a total wreck, 02 FLHR, that I looked up in the computer and found was still on ESP 6 months remaining, LOL. I fixed the bike but never used the ESP just couldn't get over the ethics to be honest. This bike had a shifted crank. I paid for parts and fixed it.
At the dealer where I was employed they always had the "queue" for service, in other words..
Dealers buddies and real squeaky wheels top, regular customers second, warranty third. At the end of the day the same parts that didn't last are the ones that are put back on the motorcycle and in the case of an early Timken twin cam (88" for example) brought in for a "rebuilt" motor they will get a roller bearing exchange motor with a cold forged crank, junk lifters, and a little better breathing head and tensioner issues fixed with new hydra-chain. Not sure how to evaluate that upgrade or not.?
Bottom line for me, and I do my own work so this is not perfect for everybody, no dealer service warranty or otherwise unless they have to do dealer proprietary work using Digital Tech which has only been once IME. I use aftermarket or genuine parts as I deem appropriate. I am not a Harley basher and do use and recommend their parts, reality is my customers buy more from them as I give them the information what to buy. I have been cut off from ordering any quantities. Interesting business model they have for sure.