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When the oil is fully warmed up the releif valve is closed and you have the maximum pressure the pump can put into the bearings, so your OP is determined by how worn your bearings are.( or sloppy). once the RV is closed you can put in a bigger spring but it wont boost pressure with hot oil. High volume=lower pressure with oil pumps I've found. In other words... If your running 35psi on the highway at tempurature theres no way to make that higher and if you add a restriction, such as a filter, it will be less. Keith