well that's quite a quick jump for repair - and that's pretty catastrophic diagnosis... I am surprised your having problems with so few hours. I would check the oil pump first... not sure if this engine has it but a clogged screen in the oil pan might cause this - since you only added less than a quart of oil. I would get a second opinion.
...A bad day water skiing still beats a good day at work...1995 Pro Star 205....