I might be just hallucinating but I feel like my Navara sounds different than when I bought it. There used to be this very typical turbo diesel humming noise when accelerating and switching from first to second grear like you can hear here for example. Basically the same sound every diesel truck makes when accelerating. I feel like I can’t hear it anymore, however the truck feels and runs just normally. Atleast I think it does.

I’m assuming that sound is coming from turbo because I only hear diesels sounding like that. How would I go about making sure everything is working properly when there’s no other symptoms that the lack of that sound?

Here’s what mine sounds like.