my radiator was replaced at a little over 70,000 miles. the car had been routinely serviced at honda dealerships though. the radiator was replaced by a different dealership than i usually get my service done at as I was in a different town when it cracked and overheated. the dealer never asked or mentioned anything about where service had been done, as did not corporate management who actually made the decision to replace it. I do not believe they even had access to my records as a dealership did. I understood it that the dealership would cover the expense and they would get a reimbursement from honda. my father had an issue with his odessy, a valve or cylinder head had a knock in it. his vehicle had 70,000 miles too and had just run out of certified warranty. he too was persistent and honda gave him practically an entire new motor with new block and all. all he had too pay for was half the labor. all i can say is it can't hurt to try the worst they can say is no