My 2003 Nissan Altima makes noise. It seems to me like there is something touches to a running fan. The noise starts as soon as I start driving and after 10-15 km the noise disappears. I know I need to change the brake pads and it does not seem that the noise comes from the worn pads as I heard such noise should stop when you hit brake. In my case the noise does not stop when I hit the brake.

One more thing to mention, the noise started after I changed the oil(Castrol) and the oil filter (mobil 1) Please help.