Originally posted by Black EO:
1. I don't know. With so many cars coming from the factory with a synthetic factory fill...I'm not sure I believe that anymore.
2. BTW...your owner's manual said to wait 4500-6000 miles?
Mine (from '98) didn't mention any specific interval for a switch to synthetic.
1. A handful of performance cars out of hundreds of models. Not "so" many!
Cylinder honing/finish and ring composition determine seating time.
If Ford recommends to wait for 4000-6000 miles (checked manual) then they probably have a good reason for it being as they know the engine honing method & finish and the rings used.
2. Yes it's in the SVT supplement. (page 13) Scanned pics have been posted multiple times in the past.
