Hi there,
Under normal conditions the oil pressure will rise as engine speed increases to the point where the oil pressure relief valve opens and dumps excess pressure/oil back to the sump, maintaining constant safe oil pressure, Car gauges can be very inaccurate, have the oil pressure tested with a master gauge, this will give a true indication as to what the oil pressure is doing, I feel you have a faulty gauge, but a test will prove the issue one way or the other.
Mark (mhpautos)
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Saturday, December 22nd, 2007 AT 6:35 PM