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IS - 2nd Gen (2006-2013) Discussion about the 2006+ model IS models

Transmission refresh

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Old Feb 22, 2026 | 11:28 AM
  #1  
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npjl
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Default Transmission refresh

Hello all, happy to have an active forum to reference since I've just got my 2011 IS350 F. While it's going strong for now, I am trying to get on top of some maintenance that I don't think the previous owners addressed. Can anyone recommend some transmission fluid? My transmission has a pretty bad leak which will be addressed, but it's also pretty old (at least 200k miles) and I am wondering if OEM Toyota WS, Aisan ATFWS, or some other fluid would be best to keep it as healthy as possible. I have seen conflicting reports on here and don't want to put anything in that will cause unnecessary wear.


Also on the ASAP list are lower ball joints and a differential check up.


Any advice is appreciated.
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Old Feb 22, 2026 | 06:03 PM
  #2  
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firestart9
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where is the leak coming from?
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Old Feb 22, 2026 | 06:18 PM
  #3  
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npjl
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Originally Posted by firestart9
where is the leak coming from?
I think it's from the pan so I'm replacing the gasket and filter. Are there other common points of failure?
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Old Feb 23, 2026 | 03:29 PM
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I've used Valvoline Max Life ATF for all my Toyota and Lexus. Meets spec. Comes highly recommended. Affordable, easy to find.
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Old Feb 24, 2026 | 05:58 PM
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npjl
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Originally Posted by firestart9
where is the leak coming from?

Found out at least some of it is from the speed sensor, so I will order a new sensor and gasket to install.
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