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Re: low oil pressure
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Jeremy in DE
I had a similar situation in my TO30. About 20 psi when fully hot and at working RPM, about 5-7 psi when really hot and idling.
After checking my oil pump I determined it was fairly worn. I put in a new one. My oil pressure jumped only about 5 - 7 psi when really hot--both at idle and working RPM. (Not sure what others advise, but when fully hot I make sure I don't go below a slightly fast idle to get at least 15 psi. Only a tiny bit more engine speed makes the difference.)
After plastigauging the main bearings, I think I would need to replace them to get the pressure up where it "should" be. Maybe someday. They are still within the range my manual permits, although near upper limit.
Replacing the pump is relatively straightforward, but in my case it was only part of the issue. Of course, every situation may be different.
As most are saying, keep good oil in it and you can probably run it as is until when/if it gets worse.
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