Hi, Just got my car back from it's 100,000km service and I was told I would need to change my rear pads and disc rotors soon. Is this common for rotors to need changing? The dealership told me that they don't machine disc rotors, they only replace them. Has anyone experienced this? And...apparently my front pads still have about 40,000kms to go before neededing replacement...and they have never been changed in the car's lifetime! Bizzare. Dan.