[st86good]

Hi,
I've been noticing some whine from the cabin these days.
sounds like supercharger. It has GM 6L45 transmission.
I got this car as used so I have no idea it sounded like this before.
Car has 60k miles and fresh engine oil.
Here's video:

+P/S fluid was low so I filled up with CHS 202. and pumped it out few times with hand pump- refilling it.

Any insights will be appreciated. Not sure this is normal noise.

[st86good]

Here’s another video from engine bay.

Let me know if this sounds normal!
https://youtube.com/shorts/7Bjum5TMlJ8?si=HEK3zAbJ7GOjA243

[firesnatch]

Originally Posted by st86good

Hi,
+P/S fluid was low so I filled up with CHS 202.

Don't our cars use CHS 11S?

[UndergroundLare]

Originally Posted by st86good

Not sure this is normal noise.

Mine sounds pretty much identical with 100k miles. It seems to whine a little louder as it gets more miles on it. I've had it since 25k.

Some of the whine might be coming from the AC compressor. I know mine whines louder when I have the AC on.

Try it again with the AC on and off and see if you can hear a difference.

[UndergroundLare]

Originally Posted by st86good

Here’s another video from engine bay.

It will likely be time for the belt, idler pulley, and tensioner around 80k. I don't think this is the source of your whine though. Here are 2 guides to replacing these parts that I linked below

https://www.fcpeuro.com/blog/how-to-...bmw-n52-engine

https://www.pelicanparts.com/BMW/tec...eplacement.htm

On the N51 / N52, if the belt slips off the pulley, and you are unlucky - it can cause damage to your front main seal. So this is something to start thinking about as you approach 80k.

[st86good]

Originally Posted by UndergroundLare

It will likely be time for the belt, idler pulley, and tensioner around 80k. I don't think this is the source of your whine though. Here are 2 guides to replacing these parts that I linked below

https://www.fcpeuro.com/blog/how-to-...bmw-n52-engine

https://www.pelicanparts.com/BMW/tec...eplacement.htm

On the N51 / N52, if the belt slips off the pulley, and you are unlucky - it can cause damage to your front main seal. So this is something to start thinking about as you approach 80k.

Thank you.
I changed all, still there. I guess it is just natural thing from N51.or with 6L45 at least.