Oil pressure at startup, runup, climb, and cruise was in the green range. After flying for about 20 minutes, tried some power reductions to descend. Oil pressures dropped below green once below 1800 rpm and were nearly at the redline when at 1000 rpm. Oil temperatures had increased as the oil warmed up throughout the flight but remained steady during the pressure drops at the lower rpms. Increasing power above 1800 rpm brings oil pressure back in green arc. Mechanic says the oil pressure relief valve needs to be adjusted. What are your opinions on whether the aircraft is safe to fly and whether it show be flown before this adjustment is properly made?
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