Bikesplendor

I had been taught by some bike mechanics to grease bolts and other threads on bikes. But recently I read a thread on a Corvette forum about whether or not to grease lug nut threads. The most popular opinion was to use grease. But it emerged, with much better evidence, that you shouldn't grease — they should be left dry and clean. The better evidence came from engineers and manufacturers.

So I am wondering what Shimano, for example, has to say. Or Campy.

And are torque specs meant for greased or ungreased? (It turned out that overtorqueing is a real issue with greased lug nuts, leading to different types of weakening and failures. The torque specs are for dry threads.)

And are some but not all threads on bikes meant to be greased?

Does this apply to all bikes, all manufacturers, and all vintages?