I have been meaning to post that I completed the fluid change finally in my S4 at around 65K miles. I did the rear diff and trans. For the trans I used Amsoil GL-5 synthetic gear oil. I have had it in for close to 1K miles now. I noticed that when first driving the car when cold (it has been near 40 overnight, although in the garage still upper 40's or so) there is some increased effort to get the shifter into gear and when shifting. But within a few minutes that goes away. And the stock fluid had the same tendancy, but I think the amsoil is slightly thicker when cold so does it a bit worse. But overall shifting is noticably smoother once warmed up. So I am happy with the trade off, and also with the price of Amsoil vs. dealer pricing for the OEM fluid which is nearly double the price (all of which is likely profit margin).
And FYI - it took just about exactly 1 gallon. Which is handy, because Amsoil sells the gear oil in gallon jugs.
(heh heh - he said "jugs" - heh heh)
I highly recommend swapping fluids somewhere around 60K miles - it is not much of a job at all, and your expensive quattro parts will thank you.
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