On Tue, 9 Oct 2018 15:27:28 -0400, ""Retired" said:

Where did you buy the new fluid ?
Usually they will take used for recycling.

I buy the atf at O'Reillys.
I called them up.
They said they take up to five gallons if they sold it.
No cross contamination is allowed they say.
So it can't be atf in a motor oil container they say.
I have to sign something before they'll take it they say.

I almost couldn't find this thread in all the spam.
Thanks!