Using Toyota ATF Type T-IV with unknown current fluid

[brillo_76]

Very valid point T4R2014 makes. Heat is the #1 killer of all ATM. It's one of the things that breaks down the fluid over time.

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[cdg11343]

It could be, but if your temps are getting high so often you may want to look into your transmission cooling situation first. Heat is not your friend regardless of ATF.

I don't know what my temps get to.

I do I know I live in Southern AZ where it commonly hits 100F in the summer time. And my T4R will have close to 500lbs of armor on it soon. And I managed to pick the lightest thinnest ATF for my fluid. Doesn't seem to be a good mixture?