I am in bc and I have 67xxxk on the odo. I was told my tranny fluid was looking dark. they mentioned they recomend a tranny flush every 40,000 to 50,000 k. I do like to do the basic myself but I don't wnat to do ANYTHING that may void the warranty while it has one. Althought I did remove the upper mounts to rotate engine to check plug gaps today, shhhhh no one say anything lmao. I asked about a coolant (engine) flush and they told me the coolant is good for 5 years. I looked at the radiator cap last week and it looks gummy to me, I don't know anything aobut dexcool but it looked like regular water in a steel radiator (not that bad but just some gunk) temp is fine have no issue there and the level is good sooooo idk.