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I know you're looking for advice but this horse has been ridden to death. You can get a consensus if you do a search on the subject and read the previous threads. Please, please, please do that search and let that subject rest in peace.
This guy asked about Amsoil. Yes you can use it in all 3 as many do but i found that a heavier gear oil SVG 75w 90 helped smooth out the shifting. No it is not too slippery(time to do some reading).