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now my fresh 440 with a high volume pump gets about 8psi hot idle with brad penn 10w30.
the oil pressure is responsive as it should be to engine RPM. any ideas?

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go w the next thicker grade. Actually if it jumps up immediately when you gun it you are Ok though 8 is getting close to the ragged edge. I'd think loose clearances also, somewhere

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I have a 1981 International truck with a 345 ci gas engine in it. When it idles it has 1-2 lbs oil pressure when hot. when you gas it it jumps up. Been that way since I bought the truck 15 years ago. It's a old utility truck with a crane mounted on it. I suspect it idled all day long when it was in service for the utility company. Anyway it won't die, it just keeps on running sometimes for hours at a time for us with the dash gauge showing 0.

Anyway to the OP, That sounds too low for a new engine. I'm thinking some bearings got wiped during start up? Sorry not good.

Might want to cut a oil filter apart to rule out what I'm saying.