G'day mate, welcome aboard
It doesn't get much more fun than the RGV.
Do you know if you're running pre-mix (add oil to tank), or if the oil injection is still working? If it's the injection, it's best to continue using the same oil as the previous owner, they should be able to tell you.
For pre-mix it's not as crucial. Popular oils seem to be Motul (510 or 710 if you're feeling rich), Castrol TTS or any other synthetic oil from a recognised brand.
Best of luck with it, there's plenty of people about who know lots and lots about strokers, and people like me who know to ask them for advice
See you out on a ride soon mate
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