I've always use the Motorcraft synthetic oil sold by Ford dealerships .Not cheap , but summer or winter , the gearbox behaves flawless . I change it every year because I track the car . I maybe shouldn't but better more care can't hurt . The car runs like new .
http://www.youtube.com/watch?v=xNwAb4Y4BNw&feature=related
http://www.youtube.com/watch?v=k6Y2aexChGs
03 Ford Focus SVT
"If in doubt...flat out". -Colin McRae
http://www.youtube.com/watch?v=k6Y2aexChGs
03 Ford Focus SVT
"If in doubt...flat out". -Colin McRae