I have a 2015 V60 T5 that has had an intermittent buzz since ~ 30,000. It's now at 100,000. The dealer went into the oil pan a while ago and that seemed to fix it but I really don't know since the noise is intermittent.

The dealer had no idea at 20,000 mi and now says "bring it in because it could be any of several things". No drive ability issues.

 

what does "intermittent buzz" mean?

 

It means that the engine sounds like it has a high pitched vacuum leak that sounds like a bumble bee. It only happens when going down the hwy at 60 mph os so.