and you have 3 months to transfer.
When I bought my stag from SA, the guy had previously bought it from WA and hadn't transfered it into SA, so it was still on WA plates in SA... I made the guy in SA put his address down and sign the transfer papers (no brainer).. When I went in to transfer it, the lady was shocked the car hadn't been transfered out of the orignal owners name first, then into the guy in SA... she said the guy in SA will recieve a fairly large fine... oh well, his bad..
You can keep your car registered in NSW aslong as you have a dwelling there and have family or friends living there so you can get the rego papers sent over when its due... but why would you want to do that? Here in WA you don't have Road worthy cert. to worry about