I'm really enjoying my new white S60 so far just passed about 130 miles since taking delivery yesterday!! I have had an issue and was hoping someone knows a solution or what I'm experiencing. When I accelerate, if I floor the pedal sometimes I get a real loud whirring from the engine almost like a loud crotch rocket is driving by my car!!! Has anyone else experienced this? My dealer filled the tank with 87 octane fuel as a part of my deal...is my car asking for premium (we have up to 91 here in vegas) or do I have some breaking in to do?