every 60-100k Km depending on how arduous the use. You can get them to have a look at the oil to see if it needs changing or not. You should expect less than $1000.
Mine at 80k Km still looked brand new.
I believe A & B Automotive Remanufacturing are the go to folk in Melbourne for ZF serving. They should be able to give you a more definitive answer.
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