For reference 2018 Caravan. I seen an article the other day while I was idle at hospital, so I didn't get a link. They were stating that to get most out of transmission you should suck out dipstick tube, which you get 2 qts approximately out of transmission every oil change. I do 30k changes if fluid is not red, I know color doesn't matter. Pros and cons. I still think filter needs changing at some point.