Low oil pressure

Good thing I have never seen a Taurus, Hundai, Toyota Tercel, Mazda 2200, anything Mitsubishi, Neon, Civic, etc. You are correct, I am just making it up to look like a dumb ***. I have never worked on cars before so I dont know ****.

OP go ahead and put 10w30 in it, drive it hard and if it eats itself you can blame the "expert" advise you got from guys that might be a plumber, waiter or maybe a gas station attendant. I certainly havent seen anybody claiming to be a professional mechanic respond. I even asked but got no answer. Its pretty easy to be an arm chair quarterback!

Anybody else with with a shop or professional experience care to chime in?

At least now you know what oil to run in your 5 cyl GM, Honda or Blazer :D

I am a professional auto technician. 25 plus years in the industry. I have been a Chrysler tech for 18 of those years.

While a manual may say 10 psi hot idle in gear is acceptable, I feel I is a sure sign of either excessive wear or a terminally failed component. The fact that pressure slowly rises when the engine is reved up tells me there is something wrong and it should be taken apart before it takes itself apart. If the oil pressure sprang to 40 or 50 psi when reved I would be less concerned and attribute the problem to worn bearings but not terminal.