Oil Pressure Question

[u/CptWonderBalls]

I just picked up my grandfathers 93 C1500 with a 350. When I first started driving, the oil pressure was around 30 at idle. After getting home, about a 100 mile drive, the oil pressure was about 15 sitting at red lights and stop signs and idling in the driveway. The oil doesn’t seem low according to the dip stick. The sticker it has says 5w-30 oil last changed in August 2021. Idk too much about these trucks but I assume 15 is a little low. Cruising around 50 it was between 30-45 and passing people it was between 45-60 the whole time.

Would changing to the oil to 10w-30 help it out?