Here's a good article that explains which oil weight to use and what the various oil weight numbers mean. It was written by a knowledgeable enthusiast. It doesn't go into much detail about which brands to use since apparently there's more of a difference between oil weights, synthetic vs. mineral oil, and new ratings vs. old. It's long and full of good info.
http://www.ferrarichat.com/forum/faq...tor_oil_basics
There's a couple of nice tables at the bottom of the article, so if you're in a hurry scroll down.
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