I wonder if a higher viscosity oil would help the stock oil pump keep the oil pressure up. I would think that it would.
..........Nope.....Because even if you use a higher viscosity oil, the oil pump flow with the stock pump is still the same.
What the Hellcat oil pump does is move the oil faster.....17% better better oil flow vs the stock 5.7 oil pumps. The Hellcat pumps have thicker impellers which moves the oil faster thru the motor
And if ya use a 5/30 oil when the factory calls for 5/20, then you could get a check engine light coming on for the wrong viscosity oil.
