For a service, I buy oil from Big W - cheapest place to get oil (I buy Shell Helix) and oil filters I get from the Spare Place in the City, around $15 and made in italy! Cheaper than a locally made one, how is that?!
For any parts you need, I mean anything always go to the spare place for alfa parts, or Turin Imports. Forget other generic auto shops, I find they are a rip off (have u seen the price of tools in Repco!! Who buys that stuff?!)
The Spare Place and Turin imports do good parts for all your alfa needs at very good prices, and have everything from general service needs to full overhaul parts.
If you live interstate, both places ship items out to customers. I believe thay are among the best Alfa part suppliers in the country, good old Adelaide again!