How frequently does the automatic transmission fluid need to be changed?

[CTScott]

The total capacity if the U340 AT is 5.68 quarts, but when you pull the drain plug only a bit over 2 quarts will drain. Pulling the AT cooling hoses and draining them and the AT cooler portion of the radiator drains about another quart. The remainder stays in the valve body and the torque converter.

[sansag13]

Originally Posted by CTScott

The total capacity if the U340 AT is 5.68 quarts, but when you pull the drain plug only a bit over 2 quarts will drain. Pulling the AT cooling hoses and draining them and the AT cooler portion of the radiator drains about another quart. The remainder stays in the valve body and the torque converter.

Thanks Master Scott,

Need little bit more detail here.

1)Where cooling hose is located?
2)How can I suck the ATF out of it? With some suction pump or when I turn on the car, it will pump out it for me.

[CTScott]

Originally Posted by sansag13

Thanks Master Scott,

Need little bit more detail here.

1)Where cooling hose is located?
2)How can I suck the ATF out of it? With some suction pump or when I turn on the car, it will pump out it for me.

The AT cooling hoses are the two small (~1/2" in diameter) hoses that both go into the bottom of the radiator (as opposed to the pair of 2 1/2" or so diameter ones for the coolant.

You can loosen the pipe clamps that connect the rubber hoses to the metal pipes and simply drain both sides. No suction is required, and you definitely should not run the transmission to pump it out.

[sansag13]

Originally Posted by CTScott

The AT cooling hoses are the two small (~1/2" in diameter) hoses that both go into the bottom of the radiator (as opposed to the pair of 2 1/2" or so diameter ones for the coolant.

You can loosen the pipe clamps that connect the rubber hoses to the metal pipes and simply drain both sides. No suction is required, and you definitely should not run the transmission to pump it out.

Hi Scott,

I have got 7 quarts of ATF WS from toyota this weekend. However when I went below the car to open the ATF plug, I could not figure out which kind of tool I should use to open it. Looks like it requires big hex key (bigger than 5/14"). I tried to look for that kind of hex key in local wall mart and home depot but couldn't find one. I would appreciate if you let me know which kind of hex key you used and from where can i get it.

[CTScott]

Originally Posted by sansag13

Hi Scott,

I have got 7 quarts of ATF WS from toyota this weekend. However when I went below the car to open the ATF plug, I could not figure out which kind of tool I should use to open it. Looks like it requires big hex key (bigger than 5/14"). I tried to look for that kind of hex key in local wall mart and home depot but couldn't find one. I would appreciate if you let me know which kind of hex key you used and from where can i get it.

As I mentioned in post #9 above, it requires a 10mm Allen. You can purchase one with a 3/8 socket from an auto parts store.

[Tedtalker]

Originally Posted by CTScott

The total capacity if the U340 AT is 5.68 quarts, but when you pull the drain plug only a bit over 2 quarts will drain. Pulling the AT cooling hoses and draining them and the AT cooler portion of the radiator drains about another quart. The remainder stays in the valve body and the torque converter.

I just performed a drain and fill with the Yaris jacked up on the drivers side only. a little over 3 quarts came out of the drain hole. Noticed when I let the jack down it quit draining. I jacked it right back up on drivers side and fluid started draining again. That's a tip from me to others here who will drain and fill. Over 3 quarts came out of mine. Yes indeedy!

[06YarisRS]

Originally Posted by Tedtalker

I just performed a drain and fill with the Yaris jacked up on the drivers side only. a little over 3 quarts came out of the drain hole. Noticed when I let the jack down it quit draining. I jacked it right back up on drivers side and fluid started draining again. That's a tip from me to others here who will drain and fill. Over 3 quarts came out of mine. Yes indeedy!

That's a great tip. Coming up on a drain and fill soon, so will give that a try. Thanks.

[Tedtalker]

Originally Posted by 06YarisRS

That's a great tip. Coming up on a drain and fill soon, so will give that a try. Thanks.

I also noticed an increase in MPG. I should have done it sooner! I used Valvolene Maxlife synthetic Automatic Transmission Oil from Wal-Mart. Toyota WS compatible. Tranny is silky smooth.

[barongan]

interesting thread, I have the same question