Go with a true synthetic (mobil1) 5w-30, it'll protect in hotter temperatures. I got this sneakin suspicion that heavier weights can clog up that vct thang.
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