every day//////// when they are defective wich is not very often check with manual for scheduled maintenance
Every 15,000 miles is what the factory recommends.
5000-7500 miles
Only need drained when water in fuel light comes on. Filter needs changed every 15,000 miles or once a year.
Every other oil change.
Its a Cummins not a Cummings when you figure that out, it might be easier to get help for what you have.
weekly
Passwords should be changed every month.
According to my dealer, it should be changed at 150,000 km.
When its old
weekly
When it is dirty.
When it is dirty.