Quote:
Originally Posted by Neylus
I listened for the noise again last night and it has definitely disappeared. I had actually forgotten about it until you posted. It was exactly as you describe, a drive-train under acceleration high pitch whistle that attenuated with speed. I'm guessing just a break-in noise.
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Interesting. I've read online from others who've experienced it that it might be the air intake or possibly a tear somewhere. Coincidentally the oil temperature on this X3 goes all the way up to the half way mark whereas my previous 2014 428i would barely break a quarter on the oil temp gauge once the engine had warmed up. Not sure if this higher engine oil temp is normal on the N55 X3 engine or not, but it's another indicator that the culprit might indeed be air intake related.