Oil Pressure Issue?

Oldmanmopar said
20/50 oil is 20 weight. 30 is 30 weight. 10/30 is 10 weight. If you only drive in warm weather and it a solid lift. put 50 weight race oil in it.

You are wrong. The base stock starts as the winter grade number but the viscosity index improvers work with temperature to increase viscosity.

Single grade oils were rendered USELESS after WWII.