I don't think at that mileage I would spend anything on it. Thats more mileage than i'd want to take on a distant road trip and know i'm making it back.
As others have said, set the money aside, do regular fluid changes and lube, and call it good. Save the cash for your next rig or potential major repair.
Come on, man! These other guys had me talked into getting Platinum AAA and heading to Tennessee.