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UPDATE: So I picked up a mechanical oil pressure gauge today and hooked it up to the engine. It read 35 psi at start and then over the course of 25 minutes idling the gauge slowly dropped to 14 psi. Which is more or less what the small gauge in the dash does. So is low oil pressure just "Deuce...

Could a bad rear main seal cause low oil pressure? I'm trying to put the puzzle pieces together. My oil pressure gauge has always read low but it would move according to RPM. Recently though it sits at almost nothing, topping out around 10-15 psi when I'm up to road speed. I also have a leak I...