Try putting your old OPS back on and see what the pressure is. I've had several replacement OPS bad out of the box in the past several years. When in doubt, use AC Delco replacement parts. ~FH
The old one broke so had to replace it. I have to return this one now cause it fell apart. I hooked up a mechanical gauge and the pressure is between 60-69psi.
I'd believe the mechanical gauge. Possible faulty oil pump pressure relief valve or some trash from the gasket change got into it? Maybe a quick drain, flush with diesel and filter change might yield some improvement. ~FH
Higher weight oil will not help A high mileage motor. As said before your motor is not being properly lubricated and will fail pre maturely
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