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Discussion Starter · #1 · (Edited)

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I'm at Toyota right now to get tranny fluid drained & refilled. First it was $89 now they said it will be $156 because apparently it's hard to get to etc. which I find hard to believe. I suppose I can't complain because it is still half the price of Lexus. But, I think in 60k miles I will attempt to do this service myself.
 

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Discussion Starter · #5 ·
The sealed transmission never need to change the fluid myth lives on. If you plan to keep the car longer than 100,000 miles then change your fluid. If not, then do not worry about it. However, Lexus will gladly sell you a new tranny if it fails after the warranty has expired. This car has a far different tranny than the 6 speed auto you had in the IS. I also have an RX350 which probably has the same tranny as your IS. You can get it's fluid changed or flushed at the dealer if you ask and are willing to pay a couple hundred bucks. I would do it every 60,000 miles. There is a provision in the owners manual under severe service for changing the fluid.

Now on the CT, it is a very simple CVT electronic trans that does not have a torque converter. It is as simple to change the fluid as on a manual transmission or differential. I plan to do mine soon as I am at 17,000 miles, but I can do it myself for just the cost of fluid. Consider it cheap insurance. You spent over $30,000 for a car, why not spend a couple hundred to protect your investment and increase its resale value?
 

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The sealed transmission never need to change the fluid myth lives on. If you plan to keep the car longer than 100,000 miles then change your fluid. If not, then do not worry about it. However, Lexus will gladly sell you a new tranny if it fails after the warranty has expired. This car has a far different tranny than the 6 speed auto you had in the IS. I also have an RX350 which probably has the same tranny as your IS. You can get it's fluid changed or flushed at the dealer if you ask and are willing to pay a couple hundred bucks. I would do it every 60,000 miles. There is a provision in the owners manual under severe service for changing the fluid.

Now on the CT, it is a very simple CVT electronic trans that does not have a torque converter. It is as simple to change the fluid as on a manual transmission or differential. I plan to do mine soon as I am at 17,000 miles, but I can do it myself for just the cost of fluid. Consider it cheap insurance. You spent over $30,000 for a car, why not spend a couple hundred to protect your investment and increase its resale value?
Oh spare me the rant. I dealt with this for years on the IS forums so maybe this forum will wise up after a few years since the IS has been around much longer. I traded in my
2006 IS with 180,000 miles and never changed the transmission fluid. It also cracks me up that some "joe-shmoe" off the street who probably doesn't have an engineering degree thinks he knows more than the people who actually designed the car. I think not.


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Dont' understand why this is relevant. US Warranty Manual states the transmission is a sealed unit and the fluid does not need to be replaced.

Found this on Prius chat where there are many discussions about when to do it. The general rule seems to do it at 30,000 miles then every 60,000 after that. It is really simple and if you can change oil you can change the ATF in your CT. It only holds 3.5 - 4 quarts and is a simple drain and fill until fluid comes out the fill hole. You need Toyota WS ATF.

Transaxle Fluid Drain & Fill (DIY Easy as 1-2-3) | PriusChat



Prius C Tranmission/Transaxle/HSD Oil Change | PriusChat
 

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All oils deteriorate over time. An oil that repeatedly gets hot will degrade quicker. When the oil loses its ability to properly lubricate the mechanical components it is there to protect it should be replaced to prevent premature failure. Now that is a fact. If you don't believe me don't worry about changing your oil. When I drained my transmission it was solid black at 30,000 miles. It isn't hard to replace fluids if you have some jack stands and a jack. Like clutchless said, "You spent over $30,000 for a car, why not spend a couple hundred to protect your investment and increase its resale value?". We all know that our cars will eventually breakdown and become worthless. That is just the vehicle life cycle. But it is about the quality of life that counts. I want my car to run smoothly over its life cycle.
 

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Oh spare me the rant. I dealt with this for years on the IS forums so maybe this forum will wise up after a few years since the IS has been around much longer. I traded in my
2006 IS with 180,000 miles and never changed the transmission fluid. It also cracks me up that some "joe-shmoe" off the street who probably doesn't have an engineering degree thinks he knows more than the people who actually designed the car. I think not.


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That's a good testament for the IS Transmission.. I have 99K on my CT and plan to change it myself while also changing the Coolant in both holes. I did the same for my 2008 Prius at 100K so the wife's CT will get the same treatment. I don't plan to keep either vehicle beyond 150K but hers is a maybe (she loves her little CT).
 

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I was going to flush the power control unit along with the ICE coolant but ended up just doing the ICE coolant. I read somewhere you have to do something special and maybe have a handheld electronic device that Lexus uses? I don't know if there is any truth to this but I didn't find much info online. I went with amsoil antifreeze with the dominator booster.
You can find my post here: http://www.ct200hforum.com/forum/le...sh-replacement-engine-power-control-unit.html

I also posted about the transmission fluid change: http://www.ct200hforum.com/forum/le.../143674-went-full-synthetic-transmission.html
I went with Amsoil again for the transmission fluid. So far my ct purrs like a kitten. Make sure to grab a 10mm hex. you are gonna need it for the drain and fill caps. Take note of the color and consistency of the transmission fluid when it comes out. If you don't mind try straining it with something really fine and posting pictures if you find any metal shavings.

I would appreciate hearing about if you go through with changing the power control unit coolant. I was just going to go to a Toyota dealer for it.
 

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Same as a 3rd Gen. Prius...

 

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What is the service interval on this fluid? In my IS350 the transmission was sealed and never needed to be changed.


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Toyota and Lexus are vague about the replacement interval, saying that the fluid is for "the life of the transmission." What this means is that when your transmission finally fails, you'll get new fluid with the new unit. This is a very simple transmission, a cluster of gears and two electric motors running in oil, and no linkages moving the gears for a "gear shift" which is why they last the way they do. But there are wear particles suspended in the oil, and if you want to extend the life of your car, change the oil. The fluid required is Toyota WS specification because it is not conductive and will not attack the wiring or insulation of the electrical components inside the transmission.
 

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Dont' understand why this is relevant. US Warranty Manual states the transmission is a sealed unit and the fluid does not need to be replaced.
It is "sealed" only in the sense that it has no dipstick. There is a fill hole and a drain hole. Toyota and Lexus are vague about the replacement interval, saying that the fluid is for "the life of the transmission." What this means is that when your transmission finally fails, you'll get new fluid with the new unit. This is a very simple transmission, a cluster of gears and two electric motors running in oil, and no linkages moving the gears for a "gear shift" which is why they last the way they do. But there are wear particles suspended in the oil. All oil suffers decay in lubrication value with heat and over time. and if you want to extend the life of your car, change the oil. The fluid required is Toyota WS specification because it is not conductive and will not attack the wiring or insulation of the electrical components inside the transmission. The wrong oil will damage the transmission, possibly by shorting out the motors. The approximately $140-$170 spent on this change at the dealer is a good investment if you intend to keep the car and don't want an unnecessary and avoidable transmission expense down the road.
 
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