Hi Jack09, Buzz here. Well, on the Boeings that we have at UAL, we take care of things like that at 200 hour, and 500 hour intervals.
Oil doesn't get changed unless we'll make a big mess (oil pump change). But the filter gets changed every other the 500 hour "B" check. As was mentioned, it doen't collect the mositure and make acids like "Cream Of Dinosaur Soup" oils.... it's synthetic.
Batteries on most of our aircraft are ni-cads, every few A checks (200 hour intervals) it gets swapped with a fresh battery and the battery shop gets to deep cycle it. The battery chargers sense the volts and replenish after an APU start, or whenever the volts drop below 28 volts.
Buzz Fuselsausage, Line Mechanic by night, DC-3 Crew Chief by choice.