Originally posted by techinspector1
I use Castrol GTX 10-W-30 year 'round in everything.

If I had 50 lbs at cruise and 30 lbs at idle, I'd be happy. You need minimum 10 lbs for each 1,000 rpm's.
The 10 lbs for every 1000 rpm's is an old tale. I'm sure you'd want more than 10 lbs at idle. At the same time, engines capable of 7000 rpm's do not need 70 psi.

Between 35 to 45 psi at idle and up to 55 lbs at speed would be sufficient. I run 5W30 Mobil 1 in my daily driver. As I'm sure you won't be doing any sub-zero driving. a synthetic 10W30 would be good for street use.

While breaking the engine in, use dino oil so the rings will seat. Sometimes synthetics work too well and the rings may no seat if used right away.

I'd run the engine to 300 miles, do an oil change, and then change to synthetic at 2000 to 3000 miles.