Al Fuller wrote:

OK guys - I have a question [not strictly rotary related].

In one of my cars, ['62 Austin Healey] the oil pressure starts off high,
but drops steadily as the car warms up, to the point where it shows only 25
lbs at highway cruise [should be double that].

I changed the oil [Castrol 20W-50], with the same results.

I would think the engine would be knocking or making noise with this low
oil pressure, but it does not.

So, what might cause this?  Oil pressure relief valve?

Thanks, Al.

 
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