Re: trans oil
More recent manufactures of GL5 claim it is safe for yellow metal. However some other sites have claimed transmission damage with it (non-Ford later model cars/trucks) and some vehicle manufactures state they will void your warranty if you use GL5. That coupled with Fords original recommendation to use Mild Extreme Pressure has always lead me to go with the GL4. I don't view it as a "flap", just information some might be interested in. If you are happy with GL5 don't see any reason to knock it, I just tend to lean toward the cautious side when it is fairly easy to get GL4 and GL5 is not really needed.
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