If it's under warrantee then bring it into the dealer. Even if they say it's fine and do nothing get it in writing stating what you brought it in for and that they found nothing. Make sure the miles are on the slip also. This way if something happens to the motor or it gets worse you have a document stating that you brought it to their attention.
I would not use a motor flush. If you have change the oil regularly then motor flush is a waste of time and money. If it's a sticky lifter there are additives you can try but I would try them after you've taken it to the dealer.
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