just bought a mazda 3 sport 2 litre 1 year old still under warrenty but just got a queary to stop me looking stupid its going back to dealer on thursday because the left indicator dosnt turn off on its own but what ive noticed is when you go at about 40 mph you can hear a whirring noise like a rrrrrrrr coming from engine and then when you slow down it stops what i want to know is does this just sound like engine noise many thanxs