I asked a similar question here a few weeks ago about my Cub engine. It starts out at 30PSI, then as it warms up, it drops down to about 16PSI.
I was told that the most likely cause of the issue was the main and rod bearings being worn.
Don't bother putting SAE30 oil in it. Waste of money. I put 20W50 in mine, which should be thicker warm than straight 30. It didn't make a snot bit of difference.
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