Hi, All, I just discovered this site and am extremely impressed with the knowledge reflected in the posts I read! So here goes. I have a '72 Ferrari Dino, 2.4 liter engine, 200 hp, 6000 miles since rebuild, 8.5 quart oil capacity. Cost to rebuild engine = ca. $9K. Cost to replace blown engine = ca. $20K. The car is driven once a month in warm weather (65-80* F)(So. Calif.)for about an hour, long enough for oil to fully warm. It is driven carefully, the engine revved to 6500 rpm a few times during the drive only after it is fully warm. It never gets humid where I live, and the engine never runs hot. I have been using dino oil, 20-50 W, usually Castrol GTX or Valvoline, and changing it annually, which is about 250 miles driven. As I see it, it would make sense to change to synthetic oil if it can offer me: 1) less damage on start up / warm up 2) more protection in the event I develop an oiling problem ( enough so the engine won't be toast before I notice something isn't right) 3) extended time duration between changes, since miles driven is a non-issue Do these apply, or, given the way the car is used, is a good dino oil just as good? If they do apply, is Mobil 1 15-50 W a good choice? Thanks mucho!