Underground Performance in Cheltenham may be able to do a pre-purchase inspection for you. They specialise in VW/Audi etc. Underground Performance
Otherwise you could get a Stateroads inspection. I did this about 6 months ago when I bought a car from Melbourne and they did a very thorough inspection. Car Inspection Sydney, Perth, Brisbane, Gold Coast, Canberra
As for the car itself, the 3.6L V6 is generally very reliable, and has been well proven as VW/Audi have used it in several few cars over the past 10-12 years (VW R36 Passat, Skoda Superb etc). Assuming its had all of its necessary servicing and been looked after then chances are it should be a very good and reliable car.
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