Hi, if your cold and hot oil pressure is within the normal range but it rises and falls with increasing and decreasing rpms (when hot) that too is normal. However, if the oil pressure fluctuates at a constant rpm, idle or a set rpm, then I would take a look at the pressure relief valve, particularly the spring as it may have lost its set, the ball and seat as either may be pitted, or there may be dirt or sludge in the chamber.
Cheers,
Dave
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