I took my front wheel into a local bike shop yesterday to get some new rim tape and a tube. The owner offered to check my wheel while I was there on his park truing stand. He felt like it needed a little tweaking. Before he started turning spokes, he added oil to each one of them. A combination of Tri-Flow and WD40. He went on to say that if I take my wheel to anyone who doesn't do this before adjusting spokes, to run away.

Is this a thing? First I've seen or heard of it.