what kind of oil for new rebuild

I named no names and did not point any fingers, why do you have such a persecution complex, ACE? Anyone who makes an assumption like that is self absorbed and indeed on the verge of delusional, IMHO. Seek therapy.

As far as spelling, yes it does reflect intelligence, along with proper english (in the US and other english speaking nations). You may consider yourself intelligent, but if you cannot communicate your thoughts and ideas accurately, info can become lost in the attempted translation.

In regards to the subject at hand, oil, it depends on the application as to what you should use. I use regular Mobil oil for break in with additive (first 500 to 1000 miles) then as long as there are no leaks or obvious problems I go to synthetic Mobil 1 and run it 5k on a change.

On my wifes Grand Caravan with the brand new chrysler crate 3.8 I changed it after it went 500 miles. Don't know what they had in it for break in oil but I know that it was a warranty replacement and it is warrantied for another 3 years 36 thousand, so I do believe they put whatever they feel is best into their crate engines for break in or they would go broke replacing them due to improper break in. It currently has Mobil One Full Synthetic 5w-30. Runs like a swiss watch with 2000 miles on the new engine. Dosn't leak or use a drop of oil.