Afternoon everyone.
I have a 2020 GMC Yukon 5.3... I was worried too when I saw my old pressure at about 18 when idle and 40 while driving at 55-60 mph. On the last oil change I added Lucas heby duty oil stabilizer and it did help a little. I mixed 1 quart of Lucas with 7 quarts of 0W-20 Mobil full synthetic and my oil pressure at idle is not about 20-23 psi and 44 while driving.. so for me, this helped picked up my oil pressure a bit. Cheers!