Hello, I am Danny,
Yes, that is true. If the transmission fluid has never been changed or is darkish brown "burnt" in color it would cause problems when changed with new fluid. The reason is that when the fluid gets burnt it has amounts of friction material in the fluid from the clutches. When the fluid is then changed or flushed the friction material is lost. When the new clean fluid is then installed the transmission usually starts to slip due to lack of friction material. It is usually best at that point to keep the dirty fluid in, maintain the level, and just run the transmission as long as it will go or until you want to rebuild/replace. I can attach a tutorial showing you how to change the fluid if you want to run the risk of damage. Let me know. Hope this helps and thanks for using 2Carpros.
Danny-
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Saturday, May 1st, 2021 AT 6:13 PM