My oil pressure goes up and down. It's always between the middle (top) and the left (low), but not extreme left hash marks.
Oil pressure seems to go down when I'm going up a long mountain or when accelerating hard. Oil pressure seems to go back up when going down hill or on a long flat straight.
At times, in hot weather (over 105 degrees outside and closer to 125 degrees on the pavement surface) the oil pressure seems to jump around a little, even at steady speed (80 mph, 3200 rpm), flat, level roads. Oil pressure goes from middle location (35 psig) to the lower lever (17.5 or 20 psig).
What the heck is causing this? If I put a new PCV valve in will that steady out the oil pressure? Is it a good idea to put two PCV valves in the line?
Should I be concerned? I'm just guessing at low rpm, the vacuum is low and the oil pressure is higher, and at higher rpm, there's more vacuum and less oil pressure. Is there any relationship between vacuum and oil pressure? What's too low or too high for oil pressure with a stock 351-C? Thanks.
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