FYI. I don't know if you have ever changed your oil and filter before
this but I believe that if the oil smells good and is a good colour,
that you shouldn't even touch it. If it is good, the oil has become
thicker and contains micro size pieces of your tranny that help it take
up the gaps that had been created due to wear and tear. This is a good
thing. Now, you just replaced the oil and filter and the oil doesn't
contain any of these particles anymore to fill in the gaps and the oil
is much thicker than it was. Just a helpful hint.