It hasn't been in the car yet, but I fired up the 572 on 10w30 Rotella conventional.
On the high side it was fine, hitting the bypass 68-70psi like the other big blocks with M63HV pumps I have had.
On the low side near 1000 rpm when it warmed up it was safe pressure, somewhere in the 20s, which I'm sure is actually fine but it does not give me a warm fuzzy feeling like
a solid 40-something does on the low end.
I may or may not adjust it to a different grade when I start driving it, but at least know it's within safe reasonable limits now.
Rods and mains were all between .0032 and .0033.
And I should probably get over that warm fuzzy feeling thing.
This probably doesn't help answer the original question at all but just trying to participate somewhat!
When the oil gets up to temp and after it shears its going to get even worse at idle. With the 15W50 I have around 40 at 150 degrees oil temp. Hot lapping going rounds it drops to 25 or so at 200 degrees. You are going to end up with something more than 30 weight most likely.
Rotella is good just to fire it and break it in, but it's not a good full time oil for performance engines anymore. No way would I run it full time in a serious engine.
Agreed, I will probably end up with a 15-40 or 20w50. I have always liked a 30 for initial fire up of most anything, though.
The Rotella I used is an older and more desireable specification that is no longer available off the shelf. I have close to 20 gallons of it do plan to use it, eventually.
Have large quantities of SAE30 straight weight, also older spec that nobody I know had problems with, to try out eventually.
It's big CI but is a low compression pump gas street engine, and beyond that pretty sure nobody besides me would consider it "serious" for no other reason than I built it myself.
