Originally posted by Kremithefrog:
Ford recommends using 5w-30. On newer vehicles 10w-30 would only be needed in a desert. And if you run a true synthetic (mobil1, amsoil,etc. not castrol) 5w-30 you can run it all year in just about any climate. 10w-30 can mess up the VCT system for ya'll that are unfortunate enough to have it, for us pre98ers, I'm not sure what it can mess up, but when I started using mobil1 the engine ran a bit better.
Mess up the VCT....don't have it anymore. 
Hector
2003 Rally Red Mitsubishi Evolution VIII
257HP/259TQ
2005 Lapis Blue Mazda 6s
RET: 00 Cabernet Red Ford Contour Zetec ATX SUPERCHARGED
160HP/141TQ
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