For what it's worth, those bearing failures were exclusively talking about the input shaft bearings and believed to be from people shifting into second and release the clutch causing a strong load speeding up the transmission from the engine side in a different way than the engine speeding up the transmission, if I'm putting this together with words properly, it's explained in one of those threads. Also explained was when downshifting the engine, if its rev-matched better rather than using the clutch to match the speeds it will be much nicer on the ISB bearing, synchros, and clutch put together.
On a completely unrelated car, my other car, it specs a 75w90 gear oil and took longer to shift in the winter when it was at 145k miles or so, switched it out with Pennzoil synchromesh and change it once a year before winter. I half expected the transmission to croak on an oil completely out of spec and far thinner than gear oil but with the thinner fluid it has shifted like butter and now over 70k miles of using it. I haven't touched the fluid in my 2000 Insight yet since I bought it, it's at 111k miles and I've been waiting until the weather is nice. I'm not experiencing any shifting issues right now, even if I pull it into 2nd gear at 30mph without a rev-match, which is try to never do anyway, but when I do it seems to operate as expected and shift quickly and smoothly.
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2000 MT Insight "Silver Sipper"
2000 MT Insight Silver "Clone"
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