Compression Ignition Addict
Join Date: Oct 2011
Location: Tehachapi, CA
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With that much usage (and I have first-hand experience on this one) or leakage, it should be coming from the High Pressure Oil System. I would check the High Pressure Oil Pump (HPOP) hoses when they exit from the pump and where they go into the top edge of the heads (just inboard of the valvecovers). Both those areas are o-ringed joints. Check the hoses too. Also check the HP Oil Rail port plugs (similar spots to where the hoses go into the heads but they just happen to correspond to the other cylinders on the engine) as they are o-ringed as well. Another spot would be the ICP sensor where it screws into the head (another one of those ports on the driver's side head front port) as that is another o-ringed joint. Of course you can try and check the IPR-to-HPOP joint and where the HPOP mounts to the reservoir along the way. Just for info mine was the HPOP to hose joint where the o-ring blew out (6 quarts in about 10 miles!).
Just out of curiosity, how's your oil usage normally between changes (without leaks)?
High Pressure Oil Pump Gasket
(Ford) F4TZ-9417-A (engine serial no. 201680 & before)
(International) 1815898C3 (engine serial no. 201680 & before)
(Ford) F6TZ-9417-A (engine serial no. 201681 & up)
(International) 1825163C2 (engine serial no. 201681 & up)
High Pressure Oil Supply Fitting O-Rings
(Ford) 5C3Z-9N693-A, (International) 1823790C1 (o-ring for HPOP hose to pump joint)
(Ford) F4TZ-9N693-A, (International) 1815874C1 (o-ring for HPOP hose to head joint, unused port plugs, and ICP)
1997 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, External Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed
SOLD - 1994 F350 CC DRW 2WD PSD, 5 Speed, 4.10 LS, SBC Con-O, Baldwin Filter, Tymar HPX Hose, DPPI DP, Bilsteins, $12 AIC, Coolant Filter, Explorer Overhead Console, A-Pillar w/ISSPRO Black Ice, EV Boost, and EV Pyro, Modified Pedestal, Gutted EBPV.