It's like a filter you can change it weekly if you want, and it will not hurt anything. You must remember though that you are throwing money at replacing something that is perfectly good with plenty of life left in it.
Wix makes the micro guard filters in the red box, the other company makes the micro guard select in the green box at O'Reilly. I've always just used the motorcraft on my 2.7, but I have looked at the micro guard and it is also made in Brazil like the motorcraft, so I'd bet they were exactly the...