Good morning I noticed something recently with my S60 2,4D (126hp) Built.07 and I wanted to ask you a question about this. Normally I rarely move the car at high speed. I really like the sound of the five-cylinder, which is why I often even drive without a radio. Recently I was a little faster on the road and I noticed that when I speeded up from about 3100 rpm the engine suddenly has a significantly different sound – it comes with a light “nag”! ze always comes at the same speed and also abruptly, so not somehow running or so… I assume that it is “normal” because the car runs well and it doesn’t sound disturbing. I would only be interested if the other people with the same engine also observe or if maybe someone knows what that is? Looking forward to your opinions! Greetings, Mani