This very good atricle was written by Omer Saleem, i am posting it here with his permission
Quite recently I experienced a strange rise in transmission problems with most Toyotas running on the Super CVT-I transmission. I did some research and what I ended up discovering was shocking if nothing else. Most mechanics would not even know that these transmissions DO NOT run on Toyota T-IV or Toyota WS oil but instead require the TOYOTA CVT-TC oil and then there was the common problem I heard that the oil mysteriously disappears from most cars. However now that I have done my research that’s not true at all, infact the prime reason in most transmission failures is that the mechanics end up over filling the chamber, thus damaging the internal gearbox and pump seals. Here is what actually happened with my Belta 2 days ago: When you open up the drain plug for any of the K-series CVT transmissions which Toyota is putting in most of its newer models, only about 500ml or less of the transmission fluid drains out, leading one to believe that the transmission was running without oil, but that is absolutely not the case. The drain plug has an internal drain tube which extends about a little more than 2 inches inside the chamber, this causes the oil level to just drop till the mouth of this tube and hence the mystery disappearance behind the transmission oil. In order to fully drain the transmission oil, you will need to open up the oil chamber and drain out the fluid. This will also require you to replace the two gaskets which are firmly placed on top of the chamber. After completely draining the oil, about 3.8-4.0 liters of oil is taken up by the transmission.
Then to make matters worse, Toyota hasn’t really provided with a dipstick or a gauge to check the level of the transmission fluid. The mechanics even at Toyota Southern argued that the side housing nut is the correct place to feed oil from and that it should be filled unless it levels off around that point. The truth is that if you do end up filling to that level you would be over-filling the chamber with about 3.5 liters of transmission oil and that can cause some serious irreparable damage. The correct way to fill the transmission fluid is via the oil feed port shown in the pictures attached below.My Belta had gone through all of the above but some timely research saved the car. I have also attached some detailed pictures and descriptions for the transmission oil change procedure.
Last but not the least, the issue can potentially affect all Toyota CVT transmission system manufactured by AISIN. The following are the vehicle models and transmissions which might be affected by the same problem. This bulletin concerns the following Toyota models and transmission codes :
Transmission Codes: K110, K111, K111F, K112, K112F, K210, P210, K310, K311, K311F, K410, K41A.
List of Toyota Super- CVT Models:
ANM10G, ANM10W, ANM15G, ANM15WAllion:
AZT240, ZRT260, ZRT261, ZRT265, NZT260Alphard:
ATH10W, ANH20W, ANH25WAuris:
ZRE152H, NZE151H, ZRE154H, NZE154HBelta:
AZE156H, AZE154HCorolla Axio:
ZRE142, NZE141, ZRE144, NZE144Corolla Fielder:
ZRE142G, NZE141G, ZRE144G, NZE144GCorolla Rumion:
ZRE152N, NZE151N, ZRE154NEstima:
AHR10W, ACR50W, ACR55WiQ:
NCP110, NCP115Mark X Zio:
ZRR70W, ZRR70G, ZRR75W, ZRR75G, ZAR60G, ZAR65GOpa:
AZT240, ZRT260, ZRT261, ZRT265, NZT260Ractis:
NCP91, SCP90, KSP90, SCP13Voxy:
ZRR70W, ZRR70G, ZRR75W, ZRR75G, ZAR60G, ZAR65GWish:
ZGE21G, ZGE22W, ZGE20G, ZGE20W, ZGE25G, ZGE25W, ANE11W, ANE10G