The manual for my 2020 tacoma says to engage 4 wheel drive once a month. Makes sense to keep it lubed ,etc. But it also says to only use 4x on dirt or broken terrain. My wife's 2013 4 runner says the same. But my 2015 Silverado manual has nary a mention of such maintenance or use.
In a perfect world I would be out, w.t.w on roads that warranted using 4x. But alas, thats not my reality at present. My best solution for now, is to run it in 4x monthly, in the rain, or when the pavement is wet.
What does the august body here have to say about this? How important is it to drive in 4x monthly?