Quite frankly, PKRWUD you're the one perceiving the attitude here. I'm just entering another viewpoint into the conversation. He was running more psi before the bypass valve "stuck partially closed." He was also running less at idle.
Old pressure 20psi@idle 60-70psi@higher revs
New pressure 50psi@idle 50psi@higher revs.
While the pump in a race car, or car that generates higher oil pressure than a Mustang 5.0 may be capable of blowing an oil filter up (I've seen this as well), the stock Mustang oil pump isn't capable of generating that much pressure to blow the oil filter. 100+psi.
I would expect pressure to continue fluctuating if his relief valve was partially clogged. As the rpms increase, I would expect the oil pressure to increase as well. 40psi@idle 60psi@higher revs is what I would expect for a really good working stock 5.0 oil system. I do agree with you that something has changed, and the oil pump could certainly be at fault, but the linear diagnosis doesn't seem accurate.
I would be more inclined to believe that the valve was stuck before now. That his long drive heated the oil up, and discharged the debris. If it was stuck slightly open it would generate crap pressure at idle, and very high pressure under higher rpm running. Exactly what he was describing. As of right now, it's performing the way I would expect a very nice system to be working. Perhaps the valve is now functioning properly?
Anyway, I'm no stranger to anybody on this board. Sorry to hear you think that I've somehow become one?
Later,
Kell
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