Many many thanks for all your help. We do a lot of old exotics, they are nothing new to us. I was merely playing it safe by asking you guys, because I trust your help (OK, and I was hoping Haas would step in). The job was easy, actually a pleasure. We take great care with all of our customers cars, and that's why this particular customer bought us his latest acquisition. There are no exotic dealerships here, the nearest Ferrari dealer is Atlanta, thats a six hour drive. We are most experienced with Porsche, Volvo and Mercedes (I just finished working on a 1958 220S). Sometimes there will be a car you just simply have not worked on before, and you want to play it safe by asking simple questions, thats all.
The answer to the question was Agip 10W-50. The modern recommend is 5W-40, 0W-40, 15W-50 and 10W-60 (Shell products where possible). It's hot down here on the Gulf of Mexico so I installed an oil I'm confident with, Mobil 1 15W-50. It took thirteen quarts (2/3 full - hot). Many thanks to Mark at Ferrari Atlanta for all his help and advice. And thanks to you guys for looking stuff up for me and making an effort to help - Ian.
