If you add more oil to the system though, can close to stock pressure be maintained? I would understand if you keep the stock oil volume (4.8L or whatever).

 

a good deal of stock oil coolers flow all of the oil from the pump through the filter/cooler and then goes back to the engine.. If you were to take a feed line off the block for a high pressure line to the oil cooler, the free flow of the oil cooler might take most of the pressure away from the car at idle and cause potential problems.

I belive if you do the filter relocation kit along with oil cooler (DIY or otherwise) that the stock system will have no problems maintaining full oil pressure, and like stock oil pressures at idle.

Oil pumps generally create full oil pressure in the vicinity of 1000-1500 rpms, and then there is a bypass that keeps the pressure reletively constant for the rest of the rpm band. If it dind't have a bypass, the oil pump would surely break, because the pressure would skyrocket at anything above 2500 rpms!

Brad