[xiaojianxp]

Hello, everyone! My Car has 2000 miles now, since I got it from the dealer, I noticed a strange noise from the engine bay after cold start. It sounds like something whistling, and comes from the right side of engine (not from the turbo side). The noise will be there for a while, whether it's idling or driving at low speed, and it's clear on 900-1000 rpm. A few minutes later or it's warm up, the noise will disappear.

Last week, I drove it back to the dealer, was been told it's normal. They started a new M4 for comparison, then heard a similar noise. But I still want to find out the cause of the noise, dose anyone know what this is? Should I be concerned?