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Lower octane can be better
I was using a 98 RON petrol (gasoline; BP Ultimate for you Aussies) in my 1987 V6 2.5. One day I had to use "premium" unleaded instead (long story) and filled it with 95 RON (Caltex Vortex). To my surprise it ran much more smoothly at idle, and I have heard from others since that the V6s, at least, may run better on 95 than 98.
As for oil -- to my embarrassment I found I had let it run below the minimum and hadn't checked it in a couple of months (suicide for an Alfa owner, I know). So I filled it with Castrol GTX2, I believe it's 20W50. I used to use this ridiculous 50W70 in my 33 when it had a terrible valve stem leak, in an attempt to cure the smoking. It didn't work, but since it led me to buy my 75, I'm not unhappy!
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