I’m coming up on 350,000 miles and was curious about changing the transmission fluid, since it seems pretty difficult to get to and “not supposed to be changed,” but assuming it should be done. Also, I am experiencing some transmissions issues: 1) shudder when accelerating uphill or around 40-55mph - similar feeling as if you’re driving over those painted lines before toll booths or driving on those warning divots on the shoulder of highways. - possible this can be fixed with new plugs (SP546) and new coils: replacing them this weekend. I will update this if the plugs/coils fix. 2) slipping/creaking sound occasionally when accelerating. Also, if I were to change the transmission fluid, filter, etc. I’d prefer to do it myself since I’m a DIYer, but couldn’t find any good detailed instructions or pictures on how to do it and how many quarts would be needed. Thanks in advance for the help!