Low oil pressure

[Stevie.UK]

Hi all

Went out for a cruise today and all was good.
Oil pressure at between 40 and 60.
Just as I got back to our Marina I saw the pressure had dropped to 20 and stayed there.
We had been out 4 hrs the temp gauge was fine and the oil on the dipstick is clean and full.

1992 V6 mercruiser 4.3

[Kevlar7r]

20 psi for an older engine fully warmed up, at idle, is pretty normal. It should come up to 40-60 while underway or above 3000 rpm. If you're getting below 20, then I'd start getting concerned.

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[Stevie.UK]

We never get above 1100 rpm as the speed limit inland is 4 mph.
But if that seems normal I will keep an eye on it

[mmwjr]

Keep an eye on it but 20 psi is normal at low rpms and a warm engine.