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Kasper your quite welcome Lifer Heck when you were a kid the wheel was still a new concept :mrgreen:

It has to be doing something to the oil pressure relief valve Think about it You have your ( unrestricted ) full flow filter is tapped off the high pressure oil galley and dumping back into the pan, if it wasn't for the oil pressure reg in the way ( #32 in picture ) then all you had accomplished...

What did you do for a metering hole in the new filter mount??, The center post in the bypass filter has a VERY small metering hole/orifice to prevent oil pressure loss from the main oil galley where it tapped off of. If you don't have any kind of metering device ( flow restricter ) than you left...

On a 230ci (mil and civie) The oil only gets filtered when the oil pressure goes over 45psi The Bypass oil filter "return" line ( #28 in pic) is plumbed into the pressure relief valve and it opens only when OP is at 45psi, below 45psi the oil dead heads at the valve .

Keep the oil changed every couple of thousand miles and don't worry about it., However there was a guy a few years back on the PW forum ( Dodge Power Wagon Forum #346 ) that blocked off the discharge side of the external oil pump ( piece of sheetmetal gasket ) he then tapped the discharge side...