Timing chain "whistle" noise

[MrBeetleman]

Recently (2 weeks) Ive noticed a whistling noise that varies with rpms. I thought, at first, it was the turbo making the noise. Reading on here I suspect the timing chain/guides.
I have a 2012 328i with78, 000 miles.
Looking in the oil fill cover there is no obvious wear on the chain, and seemed tight when I tried to move/wiggle it.
A few questions :
How long can a slightly noisy timing chain last before self destruction?
What else might be causing the noise?

Sent from my SM-G955W using Tapatalk

[White94RX]

Timing chains don't make a whistling noise. It's a very pronounced whining sound. Like a power steering pump that's low on fluid. A whistle noise could be from the turbo, but I couldn't say for certain without having the car in front of me.

[MrBeetleman]

Oh. That's good news (I think). I'll have to do some more investigating.

Sent from my SM-G955W using Tapatalk

[Critter7r]

It could be an air leak from the engine too.

I recommend getting a smoke test for the intake and crank case venting system.