Originally Posted by shineboy
Supplment says see manual. Same as standard Focus but I will go by severe duty since its turbo
For the sake of the turbo and all the high temp that's in there use the full synthetic. Having already done mine at 1200 miles after tracking the car I can say you will notice a difference in the oil press and oil temps.
I change mine every 3000 to 5000 miles under "normal" conditions, but under track conditions I will dump it every 3000 period.