2011 335i E90 N55 still under warrenty

[projectman]

Hey everyone,

I recently have purchased a 2011 335i E90, 6 speed, M Sport, with about 37k miles on it from a private seller. They took great care of the car and it looks great. Of course,after driving it around for a 1k miles you begin to notice its quirks.

Two main ones that I would like to discuss:

When I make a sharp turn, like when I am turning in a parking garage, once I turn the the wheel more that 45 degrees, the power steering starts to make a moaning sound.

The second is hard to describe, when the car is turned on and idling, I can hear an extra noise in the engine. It sounds like something is worn down and not running completely smooth. What comes to mind is water pump, belts, I really don't know.

Luckily the car is still under warranty for the next 6 months. My question to you guys, is how can I best describe or get the dealer to recognize and find these mechanical issues before the warranty expires. I have never dealt with the dealer and a warranty, so I am not sure how the process works.

Please advise.

[dworthy]

Always a good idea to complain about it now to them, and try to get a mechanic to ride with you. You have an electrical water pump, so it maybe something else that is grinding like an idle pulley.

[bmwdirtracer]

The tensioner pulley on that engine likes to fail; very often, when it's dying, you'll see the belt riding too far forward on that pulley.

Have you checked the power steering reservoir for fluid level? You'll need CHF 11s if it's low. Don't use anything but the correct fluid.