Re: 2006 Ford Focus transmission fluid
I just recently changed my transmission fluid when I changed my oil three weeks ago. It was the first time I had changed it since I put the Stage 2 clutch in back in October 08 and I had around 20,000 boosted miles on the fluid. I'm also doubling stock HP on a 07 putting it under heavy abuse every day so I feel it's justifiable. For your's, if it's just a stock daily driver, I would say every 60k miles.
2007 Turbo Focus - Stage 2 Turbocharged, 12.93 @ 105mph
1993 Ford Mustang LX - 5.0, cammed and stalled