6V92 Engine Maintenance Schedules

[Pascao]

This topic is about maintenance schedules. I'm getting confused with what I'm finding in the manual as far as when I should do what. So, with that in mind, I'm reading the manual. Here are things I'm reading:

1) oil changes - 3 months or 6000 miles - really? Every 3 months!!!
2) transmission fluid/filter - ever 25K or 1 year - yearly???
3) rear axle fluid - every 6 months change fluid???
4) U joints/slip joints - grease monthly?
5) what's a "shutterstat"?
6) no mention of how often to change antifreeze

I have to say, if the above is truly the recommended schedule, no wonder the engines in commercial service last so long, as that is aggressive!