Hey y'all,

I’m sure this question has been brought up many times, but I can’t seem to find any information. For some reason, it is not letting me upload the video.

I have a 2018 SL 95,000 miles. I just noticed this whining yesterday. The fluid is topped off. I stopped by a repair shop. The mechanic told me it was normal but my instincts are telling me otherwise. I can hear it really well if I put my ear to the reservoir cap.

Hoping someone can share their experiences if any!

Thanks in advance

 

A slight whistling sound at the tank is often related to the EVAP (fuel vapor pressure) system and may be normal.