I just rebuilt one and i ran it in for 500 miles on the advice of the local rs owners club.Thinkin about it,when i got the car new,ford did the first service at 600 miles and told me i ccould floor it from then on.As far as runnin in,dont go over 4000 rpm and it is advisable to drop the boost down.The oil i used was a 10-40 but cant remember what type it was.It wasnt good quality but I was told that if you put good oil in you dont get it run in properly coz you get very little wear.It sort of makes sense to me.Hope this is right mate.Mine is lovely now its run in.(think it was a mineral oil)