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No problems, that is perfectly normal for the oil pressure. The reason it get slightly lower as you drive is because as it warms up it lowers the pressure because the oil becomes slightly thinner. Here are the factory specs on it, thanks
OIL PRESSURE (MINIMUM-HOT)
41 kPa at 1,000 engine RPM (6 psi at 1,000 engine RPM)
124 kPa at 2,000 engine RPM (18 psi at 2,000 engine RPM)
165 kPa at 4,000 engine RPM (24 psi at 4,000 engine RPM)
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