When I first start my Subaru it makes a high pitched sound that eventually goes away. The dealership checked and replaced the belts, but the sound is till there. They said it is a common issue with the 6 cylinder Outback, but I don't buy it.
I would take it to the dealer and have them diagnose it some more there are some common whining noises coming from that car. It could be in the transmission, the wheel bearing, drive shaft, fuel pump or something else.
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