Oil pressure please help

Knocking isn't good nor is having to run super thick oil to get good oil pressure. Does the knocking go away a few seconds after you start it or does it knock all the time? 50 weight oil is real thick and harder to pump so it takes a few seconds longer to reach the bearings and I've heard engines knock for a couple seconds till the oil gets to the bearings when using thick oil. Older Fords are famous for that.

Your description of having 30 psi pressure at idle and 20 down the road is puzzling. Should be higher going down the road. I haven't even seen that happen when all the bearings are roached.

You ever seen that one Rick?