There is a new oil on the market, I saw it at the PRI convention this past winter. I beleive it is now on the market, supposed to be better than anything else on the market. It's call Mucle Car Oil. Beleive it or not, it actually comes in the old school round tin cans so break out that old oil spout if you still have one...

PS: My friend Mike's 65 Tempest, brand new 400, all new parts. Did the break in, changed the oil and went to Jacksonville last w/e for an all Pontiac show. Wiped cam! Why anyone would build a motor now days and not go with a roller cam and lifters is beyond me. I could not convince him, the engine builder could not convince him. Now, pull the cam & lifters and try again!