Stop in for a cup of coffee

Mattax said

and or a high pressure relief spring will result in even higher pressure at the pump when using cold, thick oil.
Its kindof like this:
View attachment 1715865668

if the bearing clearances were set tight, then don't use high viscosity oil unless its running very hot.
Very hot being something like 250 - 300*F in the pan.

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I really know nothing about that engine. the 70psi of oil pressure was when it was warmed up too. the VR1 20-50 was the only oil I could find with zinc in it. (my original plan was to buy o'reillys brand 10-40 and put a bottle of zinc additive) but guess what? they were out of stock and couldn't tell me when they would get it back in stock.