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Oil pressure decreasing, not reaching static RPM

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jpuetthoff1

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Well, first engine issue since buying the ‘76 Archer with an O360-A4M 4 years ago.

1) after start-up at sub-freezing temperatures, with pre-heat, oil pressure normal, then after warm-up (75 deg+) decreases, to point that I am unable to reach green again. Idle oil pressure decreases into of just short of the red marking (25 psi).Tried on two different days, with same result.
2) Static RPM barely reaches 2200 RPM.
Mag checks are good.

Any advice is appreciated. Waiting on room to get into shop.

Oil level was at 6 1/2 qts. Last oil change was 2+ months ago and flights after that were normal. No oil loss.
 
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