Low Oil Pressure after motor gets warm

[jacoustics]

My 2000 24v has low oil pressure after motor warms up. when i start the motor it has 55psi. When i come to a stop the oil pressure drops to less than 6psi. I have changed oil and filter.

 

[Rollin Coal]

do you have a real gauge on it? the dash gauge doesnt display real oil pressure down that low. the FSM says 8.5-109.5psi is in the normal range