Oh no..not another oil question.
Some Say,,Crisp and Dry is the way to go.
Some Say,, What does it say in the Handbook
Some Say,, use this interweb thingy and look up just about any oil manufacturers site (EXCEPT Crisp and Dry..obviously) and see what they recommend for your car.
They will give an option of semi-synthetic or fully synthetic.From there on its how much you want to spend.
Does it make any Difference???
Either way, as long as you change the oil and filter at the recommended intervals I'd venture to suggest your Alfa engine will come to no oil related harm. For what its worth I use a semi synthetic in my 2.4JTD and Kia Sorento 2.5CRDi.....and (wait for it) Crisp and Dry in the wife's Skoda