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I have always used Kendall 40 wt. Race oil in my engines, never had any oiling problems, but since Kendall sold out & changed their product, I don't know what I will use anymore ...
Here's an oil story for you:
I just sold a customer rebuild parts for a Ford 302 he put in a '63 Comet.
I gave him a Comp. Cams Hyd. Cam & lifter kit with an MSD distributor.
The break in seamed to go well until about 5 hours later.
The engine stoped running ...
... checked fuel, O.K., checked spark, N/G. Pulled the cap off & the rotor was not spinning. Pulled the dist. out & the gear was worn like it had 150,000 miles on it. The cam had 5 worn lobes & 2 lifters were almost worn through!
I called Comp. Cams & went over everything, they sent me a new cam & lifter kit & told me to use the new Poly Gear.
(side note: the original stuff that came out of the engine with 65,000 miles on it looked fine.)
The custome said he had 60lbs of oil pressure during break-in & about 15lbs at idle, seems typical Ford to me.
Put in all the new parts, rechecked everything ... 8 hours later, a valve tap ...
... Cam & lifters worn out, one good note, that poly dist. gear still looked new.
Engine is out & back apart now.
Looking on the Comp. Cams website one night trying to see if there is a situation with their product I came across a bulletin about breaking in your new engine with ... ROTELLA ... hmm, no one mentioned this to me on the phone, well we will search for another problem first & then try this oil.
click here --> ROTELLA bulletin
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<font color="blue">UPDATE:
Put a new cam & lifter kit in the 302 (Crane (customers a little jittery) & he used Rotella 15w40 to break it in.
He has driven the car about 200 miles so far without a noise or anything.
Seems to have been the whole problem.
Two thumbs up for Rotella T. </font>