What type of trans oil does and how many lts
You should change your automatic transmission fluid in Toyota gearbox at least after every 30,000 miles.
If it is an automatic transmission every 30 thousand miles.
The transmission fluid on a Toyota Sienna should be changed every 100,000 miles. This helps to prolong the life of the transmission and improve performance.
50,000 mi
Every 15,000 miles.
if it is a automatic transmission you should change it every 15,000 miles, and if its a manual its recomeded at 30,000-45,000
your choice if you wanted to but not needed,
2014 model should be under warranty. Any transmission related issues must be addressed to Toyota dealer. You should not have to pay anything as far as the issues are real.
You do not need to worry about that. Toyota uses stable transmission fluid that can last way pass 150K miles. Unless you have problems with the transmission, you do not need to worry about it.
you do not need to change gaskets just a good flush will do the trick If the transmission pan has been removed, then you should replace the gasket. The only other reason for changing it is if it is leaking transmission oil from the gasket. Otherwise the above answer is good. Just watch out that whoever does it doesn't over tighten the plug. Toyota overtightened my wifes and trashed the threads. Had to replace the whole pan and Toyota wouldn't fess up to their mistake! There goes another couple hundred bucks!
Your 1992 Toyota transmission will hold 12 quarts of transmission fluid, when it is empty. You can check the transmission fluid level with the dipstick.
Check your owner's manual, but it's somewhere near 60,000 miles.