I own a AUII XR6 and I followed this procedure when 'breaking in' my engine.
for the first 1,500 km never take it much past 3-3500rpm, also vary the RPM whilest driving.
up to 5000km pretty much anything goes but at 5000km, change the oil to a high quality MINERIAL OIL, not synthetic - read your manual for what spec oil.
After 5,000km go nuts and have it serviced as per normal at 15,000 intervals.
My car now LOVES to rev feels like it can drive all day at 5000rpm in 2nd/3rd gears. Done 24,000 in 11 months and it feels beautiful
Falcon Killer (if you believe what Ford Service Departments have to say about me)
AU II XR6 - October 2001 ~ December 2002 - RIP
BA XR6 - December 2002 ~ Soon to disappear if Ford CRC can't fix it....
45,000km service coming up - and i'll be asking for a sizable list of fixes:
* Gearbox (3rd time)
* Steering click (5th time)
* Brake Shudder (2nd time, and has the applied "Fix")