thanks all....A salesman from Alfa Romeo in Australia suggested me to buy Castrol Formula R 10W-60 but this has been rebrand into Castrol Edge Sport 10W-60. Do you think it works?
That's what I've used in mine since the 1st service. I buy it in 5-litre containers from Autobarn or Repco whenever they have 20%-off sales. Last time I looked RRP was ~$70. I use 4.4 litres for the oil change plus have a bit left over for first top-up