The flush stuff doesn't matter. Just with your first time with synthetic, I'd change it by 3000 miles. After the first time, you can go longer (usually 5k miles or more, depends on your engine and your driving conditions).
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15