GM-GMC: 350 engine oil pressure, engine oil pressure, three quarters

Question
what should the oil pressure be at idle and 55 miles per hour

Answer
at start the pressure will be above half and when you warm the vehicle it should drop to about a quarter at take off it should go to half and if you cruise at 55 it should fall steady just before the half or inbetween the half and three quarters depending on the oil you use and if you oil was recently changed