drainandfill

Alright, so I've been checking all over Mazda 6 club forums and more, but I need some help. I bought a 2008 Mazda 6i 2.3L 4-cylc automatic with 115k miles back in April 2018. ATF was still reddish when I checked sometime early 2019 but now it's very dark brown / possibly black. Just 2 days...