i got several balers , my big one that runs all day long gets an oil filter once a year, i believe its a 50-100 micron screen. i never changed the oil , but the filter change require a top up of about 1/2 gallon. oil tank is about 25 gallons. operating temp is 90-100 degrees, full oil change would probably cost $500. i might top up a balers oil tank every 3-4 years, maybe drain it 6-10 years, but the tanks are huge
best thing one can do to your gm trans, is big trans pan , aux filter or bi-pass filter, tt-stat delete, and GM's new torque management technology, should last 250k miles if all is well