I have a 2013 BMW X1 i35 ( inline 6 Turbo )
It is making a really loud annoying " whine " kinda sounds like squeaky belt/pulley ?
My mechanic suggested I change the belt, and said if it still sqeels it would be the tensioner. Well it still does ; so I ordered a tensioner , and both idler pulleys. Everything is changed and it squeals from the outside but not as loud anymore ? Any ideas ?