I still have the dry PTO and I check mine yearly, 1st time at 8k miles, last time at 30k, it still looks as new, the last couple of times the grease still looked the same, no new grease needed. Think of trailers with packed wheel bearings.
Nothing against the Wet Pto, just my own choices.
Btw: my pto was properly greased from the factory.
Marvin
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