lancer0220 is right, operating your car at that speed will raise the temp of everything. CVT fluid would take longer but its going to start cooking your internals. If you do that hard driving often, i would think about changing your CVT fluid and engine oil alot more often.
I assume you are tracking this car, if thats the case, you should consider a very large transmission cooler.
it means you brought your fluid and transmission into a temperature range that is not recommended. You reduce the life of the fluid greatly when you do this. I highly recommend you consider changing your fluid at the severe change interval.
To put this in perspective. high temps in the transmission isnt that easy to do, there is alot of fluid in there and most of the parts doing the work are submerged in fluid all the time. if you had that warning come up. it means you were seriously running it hard.
Someone tell me "don't replace your automatic transmission fluid", is it true?
dont replace it with Automatic fluid. ONLY USE approved MITSUBISHI CVT fluid. Another brand which is ok is the ENEOS CVT fluid. Dont use Auto or Manual fluid, or your transmission will be dead in a few minutes.
I have got my fluid hot before and you could smell it burning just by driving through the canyon in sport mode doing tons of shifting. I have never got that warning. Maybe the tranny could take a lot more abuse then what I do to it? Who know.
Canyon, Canyon, This actually happened to me!! Is this the reason?!
yet another question about CVT's longevity, what's the longevity of CVT Transmission, in km??
No one knows how long the CVT transmissions last, especially this one. With regular maintenance and NOT overheating it, then a long time... Take it easy on your car, if you beat it up expect it to break, but don't expect mitsu to cover it under warranty due to abuse!