Builder suggests 10w-30 for my 360. My motor was built as a "steet strip package". He said my motor should run @ 25 pressure hot at idle and 50 psi when off idle. I'm going to warm it up do the oil change with the brad penn 10w-30 and a WIX filter as he recommends (I use WIX anyways). Then I will Check the pressure to verify where it is at. I had looked at the gauge I have under the hood and verified it had pressure not specifically what it is at, my bad I guess. Only had under hood small screw in gauges for break in monitoring as I'm going for the stock interior look. Thanks for all the input, hope to get to it tonite.