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You should change them after every feeding because they should be washed after every feeding.
weekly
Passwords should be changed every month.
According to my dealer, it should be changed at 150,000 km.
When it is dirty.
When it is dirty.
When its old
weekly
it is best to feed them from a syringe with no needle of course. If they don't take the bottle then you have to use a syringe so you can make sure they are getting the milk... ask you vet to give you some that don't have a needle... they should for free... and they should tell you how much and how often.
If you do not drive it often, I would recommend getting it changed every 3 months. That is what many mechanics tell you to do.
30000 miles
The engine oil should be changed every 3000-5000 miles