06 s60 2.5t whine on start and acceleration
 

It is an 06 with 63,000 miles on it. It whines when I start the car up in the morning at a higher than normal rpm. After about 30 seconds the rpm drops back to normal. When driving and especially at low speeds I hear a whine but it isn't audible at higher speeds. The initial engine idle whine time is decreased if I just used the car recently. Any ideas?