Z4 3.0i - Whistling Sound
I have this whistling noise when 1,000~2,000 rpm.
I hear no whistle when it's idling, but when i gently press on the gas pedal, it makes the whistle and the engine revs right after.
I hear it the most when I'm driving in the parking lot, rpm around 2,000 it makes the sound and when it revs up, it disappears. Only whistles on low rpms.
I've already changed the oil separator, and i don't know what else to do.