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I changed the fluid and filter in mine at 103K miles using genuine ac delco dex VI.
I changed the fluid again at 160K miles using maxlife.
now at 168K miles.
I haven't felt or noticed any difference. Shudder when I bought the car was fixed with new dex VI.
hasn't ever returned.
after 60K miles the dex VI looked oxidized, but nothing like what I drained out at 100K miles.
so I'd stick closer to the 50K mile "severe service" fluid schedule that GM recommends.
100K miles is simply too long for maximum hard part life IMO.
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