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That's motor oil drained from a diesel with 10,000 miles on it right?
OK joking aside, this is my experience. Asked Toyota dealer to change around 65,000 miles and I was told it does not need to be done. At around 100,000 miles I asked a Toyota dealer to change the trans fluid. I was billed for it but I am sure it was never done. At around 160,000 miles the truck went into limp mode with no codes.


Took it to a independent Toyoda shop owned by a Toyota Master Mechanic and asked to have the fluid changed. Of course a power flush was done and I was told that the fluid was black. A few thousand miles later I was getting the check engine light, codes were transmission slipping in reverse, 1, 5, and 6 gears, replaced transmission. Had the new transmission fluid changed at 50,000 miles and the fluid looked red and new.

Attempted to change a friends trans filter and fluid in the pan and one pan bolt broke after working it a bit, then two others were tight after breaking them loose. So I left the pan on and drained the pan and the fluid was black. The forever transmission fluid ( or until it is out of warranty) in the sealed transmission seems to be the Tundras down fall.

Do transmission fluid changes at least every 50,000 miles is what I am going with. My 2000 Tundra had a trans dip stick and a drain bolt on the pan. I changed the trans fluid from the pan with every other oil change at 3500 mile intervals, so 7,000 miles on the trans fluid. It was easy to keep it fresh on that truck.
 
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I would do drain and fills until it is red and then annual or 50,000 miles.
For my friend's truck that was purchased about six weeks ago with 104,000 on it we will be taking it to a Transmission shop and the owner said they will remove the pan and easy out or weld nuts to the broken bolts so they can get the remaining stud out. Then the filter can be changed and new fluids added. Once the broken pan bolt issues is resolved and never seize is on the pan bolts changing the pan fluid and filter will be easy from then on.
 
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