Is 20W-50 too heavy for my 340?

dadsbee said

We can keep saying what "we" use all day long here. The only real question is..."what does the OP need". He has yet to declare what he WAS using and the need if any to switch to anything else !

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The past is a little gray for me as it was 4-1/2 years ago AND another lifetime. It is indeed possible that I used the 20-50 VR1 just prior of shutting down for restorative work. I recall seeing “low” oil pressure from my inexpensive electric oil pressure gauge but never documented it nor verified it that I can recall with an accurate hard lined pressure gauge.

What I do know right now is that I currently have 5 quarts of 20-50 VR1 and using a mechanical hard lined oil pressure gauge measure 60 psi using a drill to prime @2000 rpm drill speed.

I have unfortunately gone medical again and can’t do anything at this point. Hoping I can get back on my feet soon god willing…