Ford recommends you change your oil and filter after your vehicle is subjected to track and/or competition conditions.
Additionally, perform multi-point inspection and the maintenance outlined in the 150,000 mile (240,000 km) normal maintenance schedule of the scheduled maintenance information after track use. Refer to the vehicle service manual for removal and installation procedures. Replace with Genuine Ford and Motorcraft
That service includes changing the trans fluid iirc, so they want you to change oil and trans fluid every event and diff every 12 hours.