I took my car, Subru - WRX/STI into the shop for them to check the blow off valve.  When I picked it up and went to leave I new something was wrong. When I brought it back to the dealership they opened it up and stated that the 3rd bearing was bad due to lack of lubrication.  I've always kept the oil clean and full.  They are stating that the only way this could have happened is that I took a sharp turn at a high rate of speed and the oil pulled to the side, causing metal on metal.  I just drove from Idaho to N. Carolina without any incidents.  This noise did not occur until I went to pick up the car. I realize this is a high powered car, but I haven't taken turns like they have claimed. I contacted Subru and they have stated that they found that there isn't any defective parts, therefore the warranty doesn't stand.  I new engin was put in 8 months ago.  I really could use some advise - they are stating this will cost $4,500 to fix.  Please - help me.

Shelly