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I did get back to a cold start last week. Initial start up pressure was great...45-50...according to the guage. New Castrol 15w-40 in the crankcase. It took about 15 minutes to drop down to about 22.5 psi. I shut it off for a bit and came back. Fired it up and only got about 15. I am...

I got a bit windy with my question...I think. What I am really wanting to find out is at what oil pressure does a person make he decision about replacing or rebuilding the the engine. I will have access to my manual tomorrow. If 20 psi is the minimum pressure to be considered 'normal'...

I am using Castrol 15w-40 diesel oil. As I said...I will get cold oil pressure tomorrow and will time the drop to 20psi

Fired up unit...runs good, but oil pressure dropped to 20 psi. I will check tomorrow with a cold start to see where it runs at cold. Also need to get another manual printed so I can troubleshoot the possibilites. I just did an engine swap with a new engine...it runs 35 psi. Just wondering...