OK, one more time, (and I do appreciate the help).
Low pressure when cold. Comes up very slowly. When almost up to normal pressure, after about 15 minutes of idling, I start getting the lifter noise. That stays for about 5 minutes and then it's gone and I'm fine the rest of the day. Unless I shut it off for 30 minutes or more, then the same thing. Once warm and running, it's all just like new, normal pressure, no noise.
If the bypass valve is very clogged, that wouldn't affect pressure? Everyone else has told me the opposite. If oil can't flow well through the bypass, surely that affects pressure, can't see how it couldn't.
Scenario: Cold start, oil thick, bypass valve sticky and clogged. Where would the oil go? The valve is open, bypassing the filter, so the only route is through the valve and it's clogged. Has to affect pressure.
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