Guy,
I haven't done mine yet but understand the following are the procedures, hope this helps:
Please be careful with the "o" ring on the cap. I understand it is only available when you purchase the cap & filter assembly.
Filter:
4G7Z-6731-AC or Motorcraft(FL2024)
Oil: Full synthetic
XO-5W50-QGT or WSS-M2C931-A spec oil
This should also be in your Owner's manual.
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Ford GT Oil Change Procedure
1. With the vehicle in NEUTRAL, position it on a hoist. Refer to section 100-02. Open the engine cover.
2. Remove the oil filter cap (6A832) from the oil filter adaptor. The used oil in the oil filter housing will automatically drain into the engine when the cap is loosened. The sealing o-ring will remain with the cap.
3. Remove the oil filter element from the housing and discard the element.
4. Install a new oil filter element and replace the cap. Ensure that the sealing o-ring is in place. Tighten the oil filter cap to 25Nm (18 lb-ft).
5. Raise the vehicle.
6. Remove the 21 bolts retaining the rear engine underbody panel (63106B08) and remove the panel. (illustration A0094313)
7. Remove the 19 bolts retaining the front engine underbody panel (115A74) and remove the panel. (illustration A0094314)
8. Remove the drain plug from the bottom of the oil reservoir and drain the oil reservoir. (illustration A0089407)
9. Remove the two engine oil sump / oil pan drain plugs and drain any residual oil from the engine. (illustration A0000058, with modification to point arrows to the drain plugs) .
10. Reinstall the engine oil pan / oil sump drain plugs. Tighten the plugs to 25 Nm (18 lb-ft).
11. Reinstall the oil reservoir drain plug and tighten to 25Nm (18 lb-ft). (illustration A0089407)
12. Lower the vehicle.
13. Refill the oil reservoir with 9.5 quarts of Motorcraft 5W-50 full synthetic oil (XO 5W-50 QGT) or equivalent meeting Ford specification WSS-M2C931-A..
14. Start the engine check for oil leaks.
15. Raise the vehicle.
16. Reinstall the front engine underbody panel and the 19 retaining bolts. Tighten the bolts to 7Nm (62 Lb-in). (illustration A0094314)
17. Reinstall the rear engine underbody panel and the 21 retaining bolts. Tighten the bolts to 7Nm (62 Lb-in). (illustration A0089407)
18. Lower the vehicle.
19. Check the oil sump level after running the engine. The level must be checked with 1 minute of shutting off the engine.
20. If the oil level is between the MIN-MAX marks on the dipstick, the oil level acceptable.
21. If the oil level in the sump is below the MIN mark, add oil in small amounts to raise the sump level to within the MIN-MAX range. Do not overfill the reservoir past the MAX mark on the dipstick.