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Yes my Burb has 216K on its L31 Vortec 5.7 and that's how it does. Makes a little piston slap on startup till it warms up. But it runs good....I guess that's pretty good for 197k
No low pressure light is not on.Is the low oil pressure light on ? Red dash lights mean " something bad happening" take action now. Yellow lights " you need to look into this " . Low oil pressure light is Red.
Above 6 psi , operating temp, idle. Good. Rpm goes up , so normally oil pressure rises with rpm, pump spins faster, pressure and volume are higher.
Sense I leak sht load of oil. I get 15w30 in quarts little thicker. I've noticed that helps the valve rattle on start up. And it raises the oil pressure about 55 60. But I've heard thicker oil will burn up the pump?it is not bad seen worse when new it is around 60 give or take if it goes lower then that though that means it is time to plan for refresh/rebuild you will be fine as long as you can maintain 25-30 psi