Did a dumb mistake this morning.
Mixed up the 10w-40 bottle with the transmission fluid bottle and accidently poured motor oil into my Avalon's transmission.
Put about half a cup in (a cup at the very, very most) before realizing that the fluid was brown, not red.
How bad is this? Must I have the fluid replaced? And if so will it be sufficient to just drop the pan and replace the gasket? Wasn't sure if this replaces all of the fluid. Haven't done this before but doesn't seem too hard.
Thanks, Brian